SUMMARY
Cant get Google import/export to authenticate/work on Mint 20.2 Cinnamon
I'm quite sure I got this to work on an older weekly 7.3.x snapshot

STEPS TO REPRODUCE
1. install fresh mint 20.2 cinnamon
2. download 7.3.0 appimage, make executable
3. start, digikam, download face data
4. restart digikam, click on google import or export
5. import dialog comes up, no name, click on "Change Account", 
   get warning of you will be logged off
6. continue (and nothing happens)

Tried on multiple computers, multiple installations, 
also tried on 20.1 Cinnamon, that works. 
Also tried on 20.1 xfce, it does now work here, either.

Although this seems to be a Mint issue, I'm having a hard time pinpointing
what to report / do in able to fix this. 
Can you help?

OBSERVED RESULT
import dialog comes up, no authenticated user

EXPECTED RESULT
browser to come up with authentication 
to Google



SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION