I've seen you also ask help for BTC RPC Explorer, where no one able to solve the problem so far. At this point, you probably want to try something else (e.g. Umbrel) or setup everything by yourself.
That is the Telegram channel in question. Surprisingly it looks so legitimate. I'm not sure what to think anymore.
That telegram link isn't mentioned on
https://mynodebtc.com/support, so it's fake support.