Provider prompts for account moved from google to office365

[gmkayaker]

A few months ago, one of my work e-mail accounts was moved from google workspaces to office365. So I set up ExQuilla to get my Exchange-based email and calendar. (I'm not actually using any Contacts from Office/Exchange).

Recently, Provider for Google Calendar has been popping up a prompt to log into the e-mail address that was moved to exchange. I tried dismissing it but it comes back a while later. I tried logging into google using that address and Google tells me that my password was changed 4 months ago (which was about when we moved to Office365).

How can I get rid of the spurious prompt? Clearly, gdata-provider has kept some vestige of the old account around. How do I flush that out?

I tried disabling Provider for Google Calendar and it showed me a list of calendars to unsubscribe from but the calendar in question isn't even listed. I cannot disable it permanently because my primary personal e-mail and calendar are on Google.

[gmkayaker]

I decided to remove gdata-provider and rebuild all my calendars from scratch so I went through all my calendar, saving their information. I found another "calendar" called "Tasks" that was still pointing at googleapi for this e-mail address so I disabled that calendar and so far, no prompts. Yay!