I can't enter the group instance created by the group owner.(error code 403)

I can join the group a couple of times right after I rejoin it, but after a couple of days you won't be able to join it again.

Group instances created by anyone other than the group owner can be admitted.

Happens only to certain groups

Not blocked by group owner

I have not been banned from the group.

Roles and other functions are not used within the group