Catalog talk:Badass Shades for Badass Individuals/@comment-39949541-20191010174129/@comment-35998649-20191010175240

Numbers are not allowed via the filter because Roblox doesn't want users to share sensitive personal info, such as phone numbers, credit/debit card information, and their home address.

However, numbers usually only filter out for users <13, if you're a few years above 13+ then you won't be affected as much by it.