[Python] Custom Domain causing Set-Cookie was blocked because its Domain attribute was invalid...

I have an app running on Render. My frontend is working fine until I try to connect a custom domain on GoDaddy and I see the error in my title.

I understand this is telling me that the cookie can't be set because it isn't coming from the same domain. But my custom domain is pointing to a domain that matches my backend so I don't know how I can resolve this issue.

I found another post with the same question and someone suggests creating a subdomain, but there isn't enough context for me to resolve the issue.

Do I need to create a subdomain on GoDaddy and point my backend there?

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