I've been trying for days to buy the 2 energies that can be obtained on Facebook and always gives me the same error "We have problems with the servers, try it later".

This is not temporary since in the main account I could buy them without problem.

Any solution?

Maybe sending a support ticket asking them to do it on their side - and sure they will take the gem cost -

Solved: The problem is that I had all the workers occupied.