ERROR 3098 (HY000): The table does not comply with the requirements by an external plugin

If you are using Group Replication (in 5.7 or 8.0), you must do all user authentication through the GRANT/DROP/CREATE USER/etc commands, not INSERT/UPDATE/DELETE/etc.

MyISAM is not replicated in Group Replication due to serious technical difficulties.

(The above comments apply to Galera / PXC, too.)

(Caveat: What I have said may not be strictly true, but I think it will keep you out of trouble, and address the Question at hand.)