Mumble invalid username

[Marvsarge1]

Hello i'm gettin this message while trying to log in mumble, can anyone help me?

[LITOralis.nMd]

If you are using Marvsarge1 , just change your name to Marvsarge1_

Can't use special characters, <>?:"{} etc, can't use non-standard English-US characters also.

[Marvsarge1]

I've partially solved it, looking another thread. However the issue doesn't concern characters becuase i've always played with Marv name, it must be some server side thing. Thank you.