Www CNAME record not working 522 error code

I have a CNAME www on the domain example.tech, but when i am visiting www…example.tech it is giving a 522 error code. And at the same time url without “www” example.tech is working fine.

I have also tried removing proxy status even though it is working?

And both of them are pointing to examples.pages.dev

Did you create the www subdomain as a custom domain in pages, or did you just create a DNS record?