I've installed fresh new installation but I didn't see any widgets. So the app is not ready to be delivered to users...
Never mind, after a few tries of re-installing the Default Widgets, it's working!

I got a same problem and I did re-install default widgets and it works again.
I am facing this same issue :(
MacOS 11.4 (20F71) / Big Sur
I am facing this same issue :(
MacOS 11.4 (20F71) / Big Sur
Make sure you have Pock enabled for 'Accessibility' in Security & Privacy System Settings, then go to the 'Re-install default widgets' as screenshotted above. This fixed my problem as I didn't enable access during original install.
Most helpful comment
I got a same problem and I did
re-install default widgetsand it works again.