Acrobat Pro 2020 Student-Teacher Edition serial # mis-registration

Thanks for pointing out their phone help line - was surprised I connected with live tech support so quickly despite not having "a registered product". More importantly, I got my issue solved! Solution consisted of 2 big parts:

1. The rep reassigned the serial # to the correct Adobe Account (in this case, they were fine with the gmail.com account; .edu wasn't required). However, even then, Acrobat Pro 2020 would immediately quit after launching. This is despite multiple uninstalls / installs, edits to my /etc/hosts file, running AcroCleanerMac, etc. - all under remote control by the rep (anyone else uneasy with total remote control where you explicitly allow multiple Privacy escalations?  Hope no key logging going on.)

2. The bigger remedy was manually deleting licensing cache files in /Library/Application Support/Adobe (forgotten which subfiles specifically). This was in addition to those in your home directory ie., ~/Library/Application Support/Adobe. Basically, I had a ton of these leftover from prior installs of Acrobat 2017, Acrobat DC, etc. and none were removed by any of the Uninstallers or AcroCleanerMac. My guess is that the Adobe Licensing app kept defaulting to these instead of fetching fresh online. Once I got rid of these, reinstalled Acrobat 2020 fresh, and restarted for safe measure, a cold launch of Acrobat triggered a mandatory login to my Adobe Account which had never appeared before.

Seems like overly complicated license controls leading to these hard-to-diagnose scenarios. But it is what it is. Thanks again.

PS - beware: almost got phished by AdobeHelpCare@outlook.com reaching out to provide support.