No recent changes to the credentials, so no issues there. However, I just tried renaming the Esri folders in AppData, removing and recreating the Portal connection, and re-publishing.... and it worked!!! I should point out that the issue has been pretty sporadic, hit or miss when publishing from Pro for me and other members of my team. But hopefully this workflow -- which isn't all that bad -- is a way to fix it when the errors start popping up again. Question: Do you think just renaming the ArcGISPro subfolders would suffice? As opposed to the entire Esri folder, which has profile information for Desktop as well, things like my Normal.mxt and .sde files. In any case, thanks so much for the suggestions! I will try to remember to update you in the future to let you know if this is a long-term solution to something that has been plaguing me for weeks.
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