Hello apple-mars,
Thanks for sharing those additional details. So you're unable to access this page on all of your devices, not just a specific one. That is helpful to know as that helps to eliminate the device as the source of the issue.
Looking at Apple's status page, they don't currently show any type of issue or outage with the Apple Music service. Also, if they were having an issue on their servers it's something they would work to resolve right away. It wouldn't linger on for weeks.
System Status
Do you have any type of firewall, VPN or security/antivirus software on these devices? If so, you'll want to try disabling that to see if that could be impacting this specific page from loading.
Aside from that, are these devices all using the same Wi-Fi network? If so, try restarting the Wi-Fi router and ideally if you have access to another Wi-Fi network somewhere, test out a computer on that. This can help to isolate if the issue is specific to that one network.
If the issue continues and you're still unable to load this specific page the next step would be to contact Apple and let them know about it: Get Support
Cheers!