I have tried it several times, and it is just not working. I have made sure not to build a single keep until I built the Elzbach palace and then building exactly 3 keeps right next to it.
Found this Post:
And wonder if this is connected to my error as in that the reason I did not get the mastery is because there is a problem with the aura.
Apologies you are running into this one @Philluminati631! We’re looking in to it.
Would you be willing to contact support here with your DxDiag and any Crash Logs?