Can you provide more information such as the version of Designate you are using, the command line you used to create the record, etc.

Note, you need to be careful that you aren't using characters un-escaped that are being interpreted by your shell.

Here is what worked correctly for me:

$ openstack recordset create --type TXT --record '"pENnXXCDU8VzyQZBy8Lkg8i8xOnG4R6FcTiRH9LTMS4GhASEcd3JilmjaQyjSyKPRqzxmYFP9VLoGZF0EyMijdXnC5lXha5hRNbJmiPbukZrtqqL2v6cumK6XT3RDly92MBpd2QyCxgHf3S6pn1dykwW2VUCu7pNZPtQXbONQAUxUGoK2rTx6fS0hxDgmfnL6JfKeYmDbqcwZsyHCm" "piafanPQv6WK7gdQ27YC11I7Hp1FnC9UY6nC5IisRUaHVf5CnuSleyswL05hmKOgqdV1sqtC4koT6FmLhSQIrKbgFZUx5MOewzIOofUrKvUCaTbXhTxPRzMvZVwU5jyG7w1BUgdBwg6YRjG0i33sEoUpEnMg6ZXQaxXZlWFz76SuGxamdpZglh7XisJDaiBxx23SGFHB"' example.com. _domainkey
+-------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Field       | Value                                                                                                                                                                                                                                                                                                                                                                                                                           |
+-------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| action      | CREATE                                                                                                                                                                                                                                                                                                                                                                                                                          |
| created_at  | 2023-07-14T00:13:40.000000                                                                                                                                                                                                                                                                                                                                                                                                      |
| description | None                                                                                                                                                                                                                                                                                                                                                                                                                            |
| id          | d8a7965c-0f31-4c1b-bb36-cc775ed280eb                                                                                                                                                                                                                                                                                                                                                                                            |
| name        | _domainkey.example.com.                                                                                                                                                                                                                                                                                                                                                                                                         |
| project_id  | 9857193d3c0f475795b5fe459bbd5b62                                                                                                                                                                                                                                                                                                                                                                                                |
| records     | "pENnXXCDU8VzyQZBy8Lkg8i8xOnG4R6FcTiRH9LTMS4GhASEcd3JilmjaQyjSyKPRqzxmYFP9VLoGZF0EyMijdXnC5lXha5hRNbJmiPbukZrtqqL2v6cumK6XT3RDly92MBpd2QyCxgHf3S6pn1dykwW2VUCu7pNZPtQXbONQAUxUGoK2rTx6fS0hxDgmfnL6JfKeYmDbqcwZsyHCm" "piafanPQv6WK7gdQ27YC11I7Hp1FnC9UY6nC5IisRUaHVf5CnuSleyswL05hmKOgqdV1sqtC4koT6FmLhSQIrKbgFZUx5MOewzIOofUrKvUCaTbXhTxPRzMvZVwU5jyG7w1BUgdBwg6YRjG0i33sEoUpEnMg6ZXQaxXZlWFz76SuGxamdpZglh7XisJDaiBxx23SGFHB" |
| status      | PENDING                                                                                                                                                                                                                                                                                                                                                                                                                         |
| ttl         | None                                                                                                                                                                                                                                                                                                                                                                                                                            |
| type        | TXT                                                                                                                                                                                                                                                                                                                                                                                                                             |
| updated_at  | None                                                                                                                                                                                                                                                                                                                                                                                                                            |
| version     | 1                                                                                                                                                                                                                                                                                                                                                                                                                               |
| zone_id     | 2b4216d3-41c3-4a40-bdb8-21667e31e211                                                                                                                                                                                                                                                                                                                                                                                            |
| zone_name   | example.com.                                                                                                                                                                                                                                                                                                                                                                                                                    |
+-------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

$ dig _domainkey.example.com. TXT +short
"pENnXXCDU8VzyQZBy8Lkg8i8xOnG4R6FcTiRH9LTMS4GhASEcd3JilmjaQyjSyKPRqzxmYFP9VLoGZF0EyMijdXnC5lXha5hRNbJmiPbukZrtqqL2v6cumK6XT3RDly92MBpd2QyCxgHf3S6pn1dykwW2VUCu7pNZPtQXbONQAUxUGoK2rTx6fS0hxDgmfnL6JfKeYmDbqcwZsyHCm" "piafanPQv6WK7gdQ27YC11I7Hp1FnC9UY6nC5IisRUaHVf5CnuSleyswL05hmKOgqdV1sqtC4koT6FmLhSQIrKbgFZUx5MOewzIOofUrKvUCaTbXhTxPRzMvZVwU5jyG7w1BUgdBwg6YRjG0i33sEoUpEnMg6ZXQaxXZlWFz76SuGxamdpZglh7XisJDaiBxx23SGFHB"