I got this error today (24th of May 2021) while working on a project for one of my clients, and trying to sign in to Dynamics 365 using organizational account.
Something went wrong!
The solution for me was to download the latest Power BI update, I think I was already using May 2021 but it seems there was an update to an update.
For some reason I only had Repair option (not install) went with things and that fixed the problem!
Take care
Emil