Matrix Synapse usernames are not valid links

[pscriptos]

Hello everyone, First of all, thanks for this great software. It was important to me to use open source software and I found it with your software.

I have noticed that I cannot maintain a matrix user name. I only get the message that I should please enter a valid URL.

The Message:

My Username in Matrix:

Is there a way to fix this?

Thank you for your support. You guys are great!

Best regards, Patrick