Deactivation does not work

Hello community,

I installed Acrobat Pro 2017 on one of our productive machines a few years ago.

Now I needed a new PC.

I installed Acrobat Pro 2017 again, using the same serial number.

This didnt work out because Acrobat told me that the license is already used on another machine.

When I tried to deactivate the license on the old PC, it was not possible. Login to my Adobe account (from within Acrobat Pro) also was impossible because of a "login-loop", I never managed to login successfully.

Therefore I can't disable the license on the old PC to properly use Acrobat on the new PC without the popup that I need to disable the license on the old PC.

As there's no 1-on-1 Adobe support for this, I need an activation count reset for my license.

How would I approach this?

Thanks for helping!