error_USER_NOT_MUTUAL_CONTACT

Sorry, iIf a person is no longer part of ahas left the group in the past, you need to be in their Telegram contacts to add each other to your respective contact lists to be able to add them back.

Note thatThey can still join via the group's invite link as long as they could still join viaare not on the group's invite link as long as they are not in the removed uRemoved Users list.
203
Applied
If a person has left the group in the past, you need to be in their Telegram contacts to add them back.

They can still join via the group's invite link as long as they are not on the Removed Users list.
203/203
Eager Cobra, May 17 at 18:27
Applied
If a person has left the group in the past, you need to be in their Telegram contacts to add them back.

They can still join via an invite link as long as they are not on the group's invite link as long as they are not on the Removed Users list.
194/203
ICO, Jun 14 at 10:17