Can't get www to work on railway

I'm trying to have it so that users can go to www.mypetnote.com and be redirected to my project which is deployed on Railway. I currently have it set up so that when users go to https://mypetnote.com/ , it works fine and shows the project. However, I recently upgraded to the hobby plan so I can add another custom domain ( the www.mypetnote.com) one and when I go to that link, I get a 400 bad request error. I've attached my DNS settings and railway settings for reference.

Solution:

is www.mypetnote.com in your allowed hosts?

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