After my original post, Adobe Support indicated (see above) to log out of my Adobe account within Acrobat 2017 on both of my macs, uninstall, re-install, re-register, etc...My current status is after having done all of these steps and the license prompt continues to exist each time Acrobat 2017 is shut down and restarted. The last time I did the Adobe Account logout in Acrobat 2017, uninstall, re-install, re-register, re-login Acrobat account was back in April 2020 (see above). I informed Adobe Support that the proposed solution did not work and the exact same repetitive license prompt keeps happening and have not heard anything since...which is why I've just been putting up with my workaround.