If you want to create a group in telegram, do you get this error?
Getting a Telegram group or channel creation error?
There are a few things you have to do.
First of all, you delete your existing telegram account completely. To delete, log in to https://my.telegram.org/auth. After entering your phone number, paste the code that will come to your telegram account on this page and delete your entire telegram account.
Then open a new telegram account from the same phone number. Most likely the problem will be resolved.
If none of this happens then create a group or channel from a different phone number and add your other number to the group and make it an administrator.