Cannot Access Apple Online Store Account
I cannot access my Saved Items, Orders or Account in the Apple Online Store. It shows that I am signed in but when I click on any of those links, The page you are looking for can't be found. This happens on both of my Macs.
When I switch the connection to my iPhone as a hotspot, I can access Saved Items, Orders and Account in the Apple Online Store. As soon as switch back to my network, the page not found message immediately appears.
This is some kind of a network issue and I don't know how to resolve. I have AT&T Internet (not fiber). One Mac is connected via Ethernet directly to the router and the other one is connected via WiFi.
Any help would be appreciated. Thanks in advance for replies.
MacBook Pro 15″, macOS 11.7