Common causes include an outdated base structure, a missing interface link, or a renamed table:

If you've added a new table in Airtable, open your workspace's base list, use the base's three-dot options menu, and select Refresh base structure. Then reopen the interface table selector. If the table still has no corresponding link in the miniExtensions source table, follow How to add tables to an existing interface.

Please be aware that these tables are stored in the dummy table of miniExtensions as a linked record field. If the table name is changed after the linked record field is created in the dummy table, the name won't automatically update in the dummy table. Manual updating of the name in the dummy table might be needed.