Can you figure out what the roles/users which send the join request to moderator? Can you check logs. Also can you check if roles are migrated correctly from your dev/test environment to prod environment.
nothing in log.Application was working fine.Its not migrated from dev/test recently.In the table UserId coming as anonymous
Can you please let me know the version of WCP in Production.
Can you upload the screen shots of the issue in order to under the case and