Did you download your .pem license file from your VIRL account? If so, go to your UWM admin portal and click on Salt and Configuration Status, located in the left pane.
After this page loads, click on the Reset keys and ID button located toward the top left of the page.
Below the text box for the minion private key, you should see a button that says Load config file. Click this button, then upload your .pem file. This will populate your private key and Salt ID and domain. You may then enter your customer email address, then click the US button to populate the List of Cisco salt masters. Unless you've otherwise been told, make sure the Master sign public key field is set to eft.pub. Once completed, click the reset button. It will take a few moments to complete the reset. After this completes, re-check your connection status.
This is what worked for me.
Please run the VIRL Server Config Validation script and attach your results to this thread?
This will give us a better idea of your current environment.
Cisco Learning Network