I'm having a RDP licensing issue with 2 of my RDP host servers

I'm having a RDP licensing issue with 2 of my RDP host servers, and need a little support.  I have two newer RDP host servers that all of our network clients connect to for our main business application - Server A and Server B (for simplicity) - these are both Windows 2012 Servers.  Both of them have been made "license servers" .  Historically, we have had other servers on the network hold the role of license server, and we've just started getting errors coming up with a couple of our 100 users, that "no license server is available".  When I run the RDP license diagnoser utility, it surprisingly shows 2 of our older license servers in the error window and says "servers are not available".  So I think I need to figure out how to reconfigure the RDP hosts to use a different server to get the RDP licenses.  What I want is for Server A to "look to Server B" for its licenses, and viceversa.  Thanks for your help.