Apple Music works fine on iPhone but not on my Mac

Hello, I have Apple Music Trial activated on my iPhone; I cannot play anything on my Mac while using the same ID. What could be the problem? Both are using the latest OS versions.

I have only these two devices, and the trial is set to expire in April 2022.

Here are the messages that I get:

When I click on Join Apple Music, it says no connection. I am connected to the Internet and everything works. I tried it at a friend's home, using my phone as a hotspot as well, but every single time it shows the same error message.

Thanks in advance for your help.