After udpating the Power BI Desktop to April 2021 version, not able to connect to dataflows. Tried the laptop reboot, sign out and sign in. Below is the error message I get everytime.
Same issues here in a GCC tenant. The solution that finally worked for me is I cleared all data source permissions while in the April release, uninstalled, and then reinstalled the March 2021 release. After that I was able to refresh from my dataflows again.