A weak connection might prevent the app from syncing your changes with Telegram’s servers.
Tap the three horizontal lines (hamburger menu) in the top-left corner. Select Settings from the sidebar. Go to Privacy and Security. Under the Privacy section, tap on Blocked Users.
The process differs slightly depending on whether you are using the mobile app (Android vs. iPhone) or the desktop version. how to unblock people on telegram
How to Unblock Someone on Telegram for iOS (iPhone and iPad)
If you have deleted the chat history with the blocked person and don't want to dig through settings, you can search for them directly. A weak connection might prevent the app from
Note: If they have also blocked you, you will not see the Unblock button. In that case, they need to unblock you first.
Your profile picture and "Last Seen" status will become visible to them again (depending on your other privacy settings). Go to Privacy and Security
The process on iOS is very similar, though the menu icons look slightly different. Launch Telegram on your iPhone or iPad.
Use Telegram’s global search. Tap the Search bar (magnifying glass icon) at the top of the main screen.
They can send you messages and call you again. However, any messages they tried to send while blocked will not appear.
Scroll down and look for the red Unblock button. Tap it.