@giacomosilli @uksitebuilder could you confirm if migrations for 3.11.0 have run and make sure that the admin-client has been refreshed after the update?
Also would be useful to see the values you have in the databases for following query:
SELECT `value`
FROM `settings`
WHERE `key` = 'members_subscription_settings' \G
Before posting them please make sure to redact secret_token and public_token values. Thanks!