Apple MDM Push Certificate

hello everyone, need your help here please!

I am using intune in my home lab thanks to MS dev, and would like to test enrolling Mac devices. I am stuck at the start, when I should feed the CSR in apple cert server to get the certificate. When I try to login to the server, I am constantly redirected to the login page, and that made me thinking I'm missing something... which is probably the developer enrollment.

However I can't find any documentation about the prerequisites: guides seem to imply that an Apple ID is enough, but it doesn't seem the case.

Am I correct in thinking I need to sign up for a developer profile for 99€ / year? or is there something else I need to do? I don't have a problem with the costs but I want to be sure before I enroll in something if I don't need it.

thanks in advance!