I'm not sure if this will be of any help with debugging.
Before I installed gnome-calendar (it's not installed by default when I did a fresh minimal install of 20.04 last December 2020), Focal's Panel Calendar was showing the data from Google Calendar.
However, after I installed gnome-calendar yesterday (Feb 12), that's when the system stopped showing anything from Google Calendar.
I tried the following:
* snap version
* apt version
* flatpak version
I also uninstalled (and also purged in the case of apt) gnome-calendar but the system will no longer show anything from Google Calendar regardless of how many times I re-added my Google account via Online Accounts of Focal as well as logged-out and rebooted.
At least from my experience, it seems that gnome-calendar changed something deep which messed the whole system in 20.04 since the Panel Calendar only stopped working after I installed gnome-calendar.
I'm not sure if this will be of any help with debugging.
Before I installed gnome-calendar (it's not installed by default when I did a fresh minimal install of 20.04 last December 2020), Focal's Panel Calendar was showing the data from Google Calendar.
However, after I installed gnome-calendar yesterday (Feb 12), that's when the system stopped showing anything from Google Calendar.
I tried the following:
* snap version
* apt version
* flatpak version
I also uninstalled (and also purged in the case of apt) gnome-calendar but the system will no longer show anything from Google Calendar regardless of how many times I re-added my Google account via Online Accounts of Focal as well as logged-out and rebooted.
At least from my experience, it seems that gnome-calendar changed something deep which messed the whole system in 20.04 since the Panel Calendar only stopped working after I installed gnome-calendar.
I hope it helps somehow.
Shalom.