I am facing a strange issue with Lightsail.

I followed the setup wizard just like I did for the previous 3 sites. Everything went well, however, the site domain (the non-www) has an invalid cert (it’s assigned to example.com) where the www domain is fully valid.

So I decided to follow this guide https://docs.aws.amazon.com/lightsail/latest/userguide/amazon-lightsail-enabling-https-on-wordpress.html which also went well. All no problems, however, the same issue again…

How do I solve this problem or how to find out what is going wrong?

Thank you.