What does this mean?
This error means that something is blocking Measure from communicating with RFMS' license server. This is usually due to security software throwing a false-positive.
What can I do?
Create an exception in your security software for "http://measurelogin.trafficmanager.net/api/" and "http://measurecloudlogin.cloudapp.net/" as well as for the Measure executable file, "msr6.exe".