I tried this but now I have a bigger problem.
The calendar integration stopped working altogether. Now I can't use your method, or my method. Clicking the + sign and selecting add meeting does nothing - no error, nothing.
Likewise, using my method, now it shows me logged out and asks me if I want to log in, and allows me to select either Google or Office 365. Clicking either button does nothing - no error provided. Tried rebooting - no effect. Tried removing and re-adding the widget - no effect.