Regarding WAF issues, same domain but different PORT

Dear forum masters

Here is a question about WAF. I have a customer here who has a domain that uses port 80, but there is a tab in it that will jump to port 90. Both of them use the same domain, so When the customer directs the CDN to cwatch, port 80 can be opened but the other redirected port 90 cannot be opened. Are there other experts who have encountered the same problem and can help me change the settings.