Redirecting problems

So I have a www.subdomain1.domain.com successfully redirected to subdomain1.domain.com
I also have a subdomain2.domain.com redirected to subdomain1.domain.com

But I cannot redirect www.subdomain2.domain.com to subdomain1.domain.com.

What would be the preferable way? I tried page rules and it did work in the first case, not the second.

Do you have a proxied DNS record for www.subdomain2?