error_USER_NOT_MUTUAL_CONTACT

Sorry, this user decidif a person is no longer part of a group, you need to leave this group, so you cannotbe in their Telegram contacts in order to add them back.

Note
herethat they can still join via the group's invite link as long as they are not in the Removed Users list.
227
Applied
抱歉,只有他的聯絡人可以將他帶回。
17/227
初音 ミク, May 18, 2019 at 14:04