Adobe Sign emails immediately moved to Deleted Items folder

hello, i have a user that no longer sees Adobe Sign emails from our organization. he has no email rules in Outlook or OWA impacting them, we attempted to uninstall Notification Center Manager for Adobe Acrobat, we attempted to disable Adobe Document Cloud plug-in for Outlook, even attempted to create a rule for all adobesign@adobesign.com emails to move to inbox, but these all fail.

the user will receive a sign request, it will immediately be moved to Deleted Items, and he will sometimes receive an action center notification about the document pending signature from "Notification Manager for Adobe Acrobat". we would like for the emails to not delete and disable these action center notifications.