Hello MinuteMan.BrF,
Thanks for reaching out! Unfortunately the only thing anyone can do when running into a restricted username is to choose another username that does not prompt the restriction. The moderators on the forums do not set the rules for usernames, and we also do not upkeep the list of restrictions. Due to that, we cannot say why that username in particular is restricted, nor can we provide a suggestion for a suitable replacement username.
Support can take a look at these cases, but we can't say if they can actually help or not. It could be due to multiple factors; depending on what it takes to rewrite rules, get permissions to do so, etc. It's not so cut and dried unfortunately.
If you would like to reach Support and ask if they could help you can do so here:
If you would like to submit a Support Ticket for help you can do so here:
https://support.ubi.com
You can also reach out to our Facebook and Twitter Support pages here:
https://www.facebook.com/UbisoftSupport/
https://twitter.com/UbisoftSupport
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