It seems to be happening because FCE is using the snap openstack client:
# snap client:
$ /snap/bin/openstack share list
HTTPSConnectionPool(host='[REDACTED]', port=8786): Max retries exceeded with url: /v2/623996b41af44b2693dd5f231a6b812a/shares/detail (Caused by SSLError(SSLError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:852)'),))
# deb client
$ openstack share list
<NO ERROR OR WARNING IS SHOWN>
# manila command
$ manila list
/usr/lib/python3/dist-packages/urllib3/connection.py:391: SubjectAltNameWarning: Certificate for [REDACTED] has no `subjectAltName`, falling back to check for a `commonName` for now. This feature is being removed by major browsers and deprecated by RFC 2818. (See https://github.com/urllib3/urllib3/issues/497 for details.)
warnings.warn(
/usr/lib/python3/dist-packages/urllib3/connection.py:391: SubjectAltNameWarning: Certificate for [REDACTED] has no `subjectAltName`, falling back to check for a `commonName` for now. This feature is being removed by major browsers and deprecated by RFC 2818. (See https://github.com/urllib3/urllib3/issues/497 for details.)
warnings.warn(
/usr/lib/python3/dist-packages/urllib3/connection.py:391: SubjectAltNameWarning: Certificate for [REDACTED] has no `subjectAltName`, falling back to check for a `commonName` for now. This feature is being removed by major browsers and deprecated by RFC 2818. (See https://github.com/urllib3/urllib3/issues/497 for details.)
warnings.warn(
/usr/lib/python3/dist-packages/urllib3/connection.py:391: SubjectAltNameWarning: Certificate for [REDACTED] has no `subjectAltName`, falling back to check for a `commonName` for now. This feature is being removed by major browsers and deprecated by RFC 2818. (See https://github.com/urllib3/urllib3/issues/497 for details.)
warnings.warn(
+----+------+------+-------------+--------+-----------+-----------------+------+-------------------+
| ID | Name | Size | Share Proto | Status | Is Public | Share Type Name | Host | Availability Zone |
+----+------+------+-------------+--------+-----------+-----------------+------+-------------------+
+----+------+------+-------------+--------+-----------+-----------------+------+-------------------+
Subscribed field-high