How do I remove the machines associated with an Adobe Acrobat 2017 license

Good afternoon

I reformatted the machines that had Adobe Acrobat 2017 installed and forgot to deactivate the license associated to the software.

Now when I try reinstall and register Adobe Acrobat 2017, I get the message that the license is already in used on the maximum allowed machines.

https://account.adobe.com/products does not seem to allow me to delete the computers associated to my SN.

How do I resolve thsi issue?

Thanks

C