My post deployment steps:

manila type-create nfs-sc1 false
manila type-key nfs-sc1 set share_backend_name=CEPHFSNFS1 storage_protocol=NFS
manila create --share-type nfs-sc1 --name sc1-test nfs 1

+---------------------------------------+--------------------------------------+
| Property                              | Value                                |
+---------------------------------------+--------------------------------------+
| id                                    | cae8e1be-ea67-4df9-b7b2-ce74e59983e6 |
| size                                  | 1                                    |
| availability_zone                     | None                                 |
| created_at                            | 2023-03-22T02:56:58.586046           |
| status                                | creating                             |
| name                                  | sc1-test                             |
| description                           | None                                 |
| project_id                            | ec101c020cd94de3bdc7ef514021e0e2     |
| snapshot_id                           | None                                 |
| share_network_id                      | None                                 |
| share_proto                           | NFS                                  |
| metadata                              | {}                                   |
| share_type                            | 37d4c44a-4b17-4dd6-ab0e-f8f3691c3c25 |
| is_public                             | False                                |
| snapshot_support                      | False                                |
| task_state                            | None                                 |
| share_type_name                       | nfs-sc1                              |
| access_rules_status                   | active                               |
| replication_type                      | None                                 |
| has_replicas                          | False                                |
| user_id                               | a6c7ceede9af466089380c141428d439     |
| create_share_from_snapshot_support    | False                                |
| revert_to_snapshot_support            | False                                |
| share_group_id                        | None                                 |
| source_share_group_snapshot_member_id | None                                 |
| mount_snapshot_support                | False                                |
| progress                              | None                                 |
| is_soft_deleted                       | False                                |
| scheduled_to_be_deleted_at            | None                                 |
| share_server_id                       | None                                 |
| host                                  |                                      |
+---------------------------------------+--------------------------------------+

after some minutes:

+---------------------------------------+--------------------------------------+
| Property                              | Value                                |
+---------------------------------------+--------------------------------------+
| id                                    | cae8e1be-ea67-4df9-b7b2-ce74e59983e6 |
| size                                  | 1                                    |
| availability_zone                     | nova                                 |
| created_at                            | 2023-03-22T02:56:58.586046           |
| status                                | error                                |
| name                                  | sc1-test                             |
| description                           | None                                 |
| project_id                            | ec101c020cd94de3bdc7ef514021e0e2     |
| snapshot_id                           | None                                 |
| share_network_id                      | None                                 |
| share_proto                           | NFS                                  |
| metadata                              | {}                                   |
| share_type                            | 37d4c44a-4b17-4dd6-ab0e-f8f3691c3c25 |
| is_public                             | False                                |
| snapshot_support                      | False                                |
| task_state                            | None                                 |
| share_type_name                       | nfs-sc1                              |
| access_rules_status                   | active                               |
| replication_type                      | None                                 |
| has_replicas                          | False                                |
| user_id                               | a6c7ceede9af466089380c141428d439     |
| create_share_from_snapshot_support    | False                                |
| revert_to_snapshot_support            | False                                |
| share_group_id                        | None                                 |
| source_share_group_snapshot_member_id | None                                 |
| mount_snapshot_support                | False                                |
| progress                              | None                                 |
| is_soft_deleted                       | False                                |
| scheduled_to_be_deleted_at            | None                                 |
| share_server_id                       | None                                 |
| host                                  | 10.110.100.201@cephfsnfs1#cephfs     |
| export_locations                      | []                                   |
+---------------------------------------+--------------------------------------+

I ran into the same error as attempting yesterday that I described here:

https://bugs.launchpad.net/charm-manila-ganesha/+bug/2012317

manila.exception.ShareBackendException: json_command failed - prefix=fs subvolume create, argdict={'vol_name': 'ceph-fs-sc1', 'sub_name': 'f25f4db5-c4ac-424f-93cf-0be5712d4dda', 'size': 1073741824, 'namespace_isolated': True, 'mode': '755', 'format': 'json'} - exception message: [errno -110] error calling ceph_mount.