Acrobat ribbon won't stay activated in Word (Office 365) - regedit fix doesn't work

Windows 10 machine running Acrobat DC 2017 and Office 365.

The Acrobat ribbon will not appear in Office apps and the addon is always deactivated for the user. We can go to Word options and reactivate it - and the ribbon will appear - but when Word is closed, the addon goes back to being deactivated immediately.

Troubleshooting:

Windows is up-to-date

Acrobat DC is up-to-date

Office 365 is up-to-date

Acrobat was uninstalled, machine rebooted, Acrobat was reinstalled

Tried regedit fix but addon does not appear under LOCAL USER. Addon only appears under LOCAL MACHINE and value of 3 is already set.

Acrobat ribbon DOES appear if Word is "Run as administrator". User was not a local admin but I made them an admin so they can at least get some work done with this workaround.

Has anyone run across this problem before and know of a solution? Thank you