If you get the following message on any channel/chat, follow these steps to unblock it.
Using the web version of Telegram on your phone.
Search on google for Telegram Web.(https://web.telegram.org/)
Login. You will receive a code on Telegram app. Put the code and continue.
Once you're in,click the 3 dots on the upper left and go to settings.
Go to "Privacy and Security"
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