I CANT MESSAGE ANYMORE?!

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I can't message in this server anymore because I need to verify my phone number but its never been a problem before and when I try to add my number it says invalid what do I do thanks in advance

[pseudo forge]

if it says your number is registered to another account, log out and log in with your username as your number (use forget password if you need) then decide if you want to use that account or delete it then you can add your phone to this account. I did this last week so dm me if you're having trouble