Error

that determining the Current Master Multi-Factor Authentication Server. the user interface will close

Things to check 

1. Make sure the server can access via IE

• https://pfd.phonefactor.net
• https://pfd2.phonefactor.net
• https://css.phonefactor.net

2. Make sure you have a valid Subscription in Azure

If you have been using a Trial this might of expired , you need to be at least on a pay as you go subscription. You need to manually change this

3. Make sure you have a Multi-Factor Auth Provider in your Azure Login

Login to https://manage.windowsazure.com/

New Portal 

https://aad.portal.azure.com/#blade/Microsoft_AAD_IAM/MultifactorAuthenticationMenuBlade/Providers/fromProviders//hasMFALicense/

Just follow the steps

1. Jump into C:\Program Files\Multi-Factor Authentication Server\Data
2. Unhide the all folders and files
3. Rename the LicenseKey to Licensekey.old
4. Re Open Program
5. skip the wizard and configure components manually so I choose to check the box and choose next.

Go back to the Azure Portal and select manage multifactor provider:

Then under download settings you have the option to generate an activation code:

Enter the activation details in the MFA server tool and click activate:

After activation I choosed to use the default group, you can create your own groups if you want:

You can check the status via https://pfweb.phonefactor.net/framefactory