I am also facing the same issue. I asked Copilot as I was unable to find any answer to this question and this is what it says:
It seems that the Microsoft 365 Developer Program is currently experiencing some changes and limitations. According to recent updates, Microsoft has limited access to the developer subscription to developers and organizations with active subscriptions to Visual Studio Enterprise1. They are also working on updates and improvements to the program, which might be causing some temporary disruptions.
It's not officially on hold, but there might be some temporary issues or changes affecting the signup process. I recommend keeping an eye on the Microsoft 365 Developer Program page for the latest updates and reaching out to Microsoft Support for more specific information regarding your situation.
I am not sure if this makes sense but if anyone of you finds a way to make sure that we can still signup to the developer program then please let me know too.
TIA,