SSL is not valid for www.domain.com

Your logs say this

https://acme-v02.api.letsencrypt.org/directory
[Sat Jan 11 08:43:07 PM UTC 2025] Multi domain='DNS:mysite.com,DNS:mysite.com'

And neither of those has a www.

And since you edited the logs I can’t tell what they really say, so I can’t help.