- Go to your phone system's web client, and log in with Microsoft account (call/email Pinnacle if you need this information and ask them to send you a "welcome email")
 - Select the Windows logo in the upper-left corner of the screen:
 
- Choose Install PWA
 
- Select Install
 
- Check "Auto-start on device login" and click "Allow"
 
- Click the "Bell" icon in the upper left
 
- Click "Allow"
 
- Click OK
 - Click the 3 dots on the left, then Settings
 
- Select "Audio/Video"
 - Make sure that "Browser" is selected, and that Ringer, Speaker, and Microphone are all set to Jabra Link 380
 

- You'll have the "Allow" the app to use your microphone and camera
 

- Headset Integration is probably disconnected - click "Connect Headset" to enable that - choose Universal Headset Driver, NOT Jabra
 

- You'll select the Jabra Link 380 and click "Connect"
 

- If everything is set up correctly, you should see something like this:
 

The new app should work pretty much like the built-in client did.