Nate River
Nate River
Hi! The same issue, TokenReceived is called only after the first app launch. The workaround is to use GetTokenAsync.  Firebase 8.1.0 / GPGS 0.10.12 Firebase 8.3.0 / GPGS 0.10.12
Another sad thing is that MessageReceived also doesn't work. I'll try downgrading to Firebase 7...
> > Another sad thing is that MessageReceived also doesn't work. I'll try downgrading to Firebase 7... > > Try placing await GetTokenAsync() before Message received ? Looks like Firebase...
Do you mean each user should execute the code after installing an UWP app from Microsoft Store?) `c:\>checknetisolation loopbackexempt -a -n=` I've also tried enabling client&server feature with no luck:...
Here is another link I've found: https://wpdev.uservoice.com/forums/110705-universal-windows-platform/suggestions/36604855-allow-localhost-loopback-capability-in-uwp-apps-de Seems it's not possible to pass MS Review with localhost loopback enabled.

 https://docs.microsoft.com/en-us/previous-versions/windows/apps/hh780593(v=win.10)#enable-loopback-for-network-access
I've found this: https://developers.google.com/identity/protocols/OAuth2InstalledApp So I suppose you shouldn't use localhost loopback for UWP. I can help you with QA if you will implement option 1 =) 
I would like to avoid using workarounds. Cause my id is upper-cased)