Not only does the credit bureau max out their password length, you have a small list of available non-alphanumeric characters you can use, and no spaces. Also you cannot used a plused email address, and it had an issue with my self hosted email alias, forcing me to use my gmail address.
Both Experian and transunion had no password length limitations, nor did they require my username be my email address.
Update: I have been unable to log into my account for the last 3 days now. Every time I try I get a page saying to call customer service. After a total of 2 hours on hold I finally found the issue, you cannot connect to Equifax using a VPN. In addition there is no option for 2FA (not even email or sms) and they will hang up on you if you push the issue of their security being lax. Their reasoning for lax security and no vpn usage is "well all of our other customers are okay with this".
the Ring app (I think) forced me to change my Wi-Fi password because I wasn't allowed to use ampersands. according to support it's because they "use ampersands in the code"
I encountered something like this at work. It wasn’t pass related, it was just a means of getting people to make text responses. Ampersands were replaced with some gibberish format, which annoyed everyone.
I got some kind of explanation from our tech people, which I understood to mean that ampersand was used to indicate that what followed was live code. Turning the ampersand into gibberish text was a safety measure to stop mischief.
I’ve noticed ampersand replacements in some news feeds too