If you are using Microsoft Edge, there is an issue (by design) that prevents Google authorization.
We recommend using another browser as your default browser.

Most common reason for this is Windows firewall on your PC preventing communication between MATRIC on smartphone and MATRIC on PC.
The first time MATRIC runs, you'll be presented with a dialog:

For most people clicking Alow access is the only thing that needs to be done, however there are special cases, for example:
 
You home network should be detected by Windows as "Private", however for some people it might be set up as "Public" in which case you need to allow MATRIC to communicate over the public network.

To check if your firewall is set up correctly:
 
1) Type firewall into start menu search and choose the "Allow an app through Windows firewall"
 

 
2) Click Change settings and find MATRIC in the list of applications, make sure the appropriate checkboxes are checked and click OK.
 

This error is caused by obsolete version of Android WebView system component which wasn't updated on your device.
The solution is to go to Google Play and update the Webview component, direct link to WebView on Google Play: https://play.google.com/store/apps/details?id=com.google.android.webview

If you are getting an error popup similar to the one above, you're most likely using Hyper-V virtualization. The issue can be solved by following these steps:

//Start Powershell or cmd as admin
> dism.exe /Online /Disable-Feature:Microsoft-Hyper-V


// Reboot
// Start Powershell or cmd as admin again
> netsh int ipv4 delete excludedportrange protocol=tcp startport=50228 numberofports=1


// Then
> netsh int ipv4 delete excludedportrange protocol=tcp startport=50230 numberofports=1


// Finally
> dism.exe /Online /Enable-Feature:Microsoft-Hyper-V /All

// Reboot