Office 365 Mac - Won't Retain Password

[WAPilot]

I've been using Office 365 for Mac on my new iMac 5K...No problems until about a week ago when Office starting asking for me to re-enter my password, I have three exchange accounts. First it was just one, then two and now it rotates between all three. I've deleted my keychain for each account with Outlook closed out, I've deleted all three accounts and re-added them in Outlook and nothing. Still does it and it's extremely annoying. Searched the net and I couldn't find anything recent - most were in the last couple years where they had the same issue - general response was to delete the keychain entry but that's not working. Anyway else have an idea or experiencing it?