It has come to our attention that some users are reporting that

It has come to our attention that some users are reporting that they have reached the limit when trying to join channels and groups, even if they don't actually reach the limit. This is a limitation of the Telegram server for NekoX's API ID, and we can't do anything about it but wait for the official removal of this limitation. You can bypass this limitation by using another client. We apologize for the inconvenience.