Detailed description:
The "USER_NOT_MUTUAL_CONTACT" error in Telegram occurs when a program or user attempts to send a message or invite, but the recipient has not added the sender to their contacts. This error is related to privacy restrictions implemented by Telegram to protect users from unwanted messages, spam, and other unsolicited interactions.
When you send a message or try to add a user to a group, Telegram checks if you and the recipient are mutual contacts. If the user has not saved you in their contacts, the system blocks any interaction attempts, resulting in the "USER_NOT_MUTUAL_CONTACT" error.
Reasons for the "USER_NOT_MUTUAL_CONTACT" error:
1. The recipient has not added your phone number or account to their contacts.
2. The user may be using privacy settings that block messages from users not in their contacts.
3. The action is being performed through automated services that do not account for the recipient's privacy settings.
Solution for the "USER_NOT_MUTUAL_CONTACT" error:
Unfortunately, there is no way to bypass this restriction, as Telegram places great emphasis on protecting users' personal data. The only solution is to remove the recipient from your messaging or invitation list if they have not added you to their contacts. Any attempt to send a message or invite a user who has not added you to their contacts will always be blocked.
If you are using automation tools, it is important to consider Telegram's privacy settings and avoid sending messages or invites to users who have not added you to their contacts.