The username and passwords fields are not auto filling on MAX.com. Here is what a reddit user figured out about this issue.
It appears to be a problem caused by the fact that the login form username field has defined the attribute autocomplete="off" (which forbids auto-filling), while the password field has defined the attribute autocomplete="current-password" (which is designed to work with the browser’s native password manager).
If you are just looking for additional advice beyond what you received on Reddit, I can move this topic to the Ask the Community section of the forum.
Conversely, if you did intend to post a Feature Request, then I would suggest changing the thread title to reflect what you are proposing (e.g., “Autofill forms that use the autocomplete attribute”). I can change the topic title for you if you agree.