I can't send messages to a supergroup

[mstrey]

I can't send messages to a supergroup. The admins group said me they don't banned my user, but the message I receive when try to send something is that:
"One of the params is missing or invalid"
Details:
"Method: messages.sendMessage
Url: N/A
Result: {"_":"rpc_error","error_code":400,"error_message":"USER_BANNED_IN_CHANNEL"}
Stack: Error
at Object.h as invokeApi
at Z.l.send (https://web.telegram.org/js/app.js:29:5996)
at n (https://web.telegram.org/js/app.js:2:17056)"

My username is @mstrey
This supergroup is: https://telegram.me/PokemonRS

What I need to do? How to back this to normal?

[iPerky (iperky)]

This is an ongoing issue with members of the following group:

https://telegram.me/BitSharesDEX

Even group admins cannot post messages or have been banned for no reason.