Same problem as here:
WP Engine host after spinning up a staging environment. I have an unlimited license and I see that it is listed in my site list in my account, but it will not validate at the site itself. Please take a look at this issue in depth because it seems to be happening for others and I have seen it before myself. I am sure that it will validate eventually but I really don’t have time to just wait for an arbitrary and inconsistent amount of time before basic functionality can be expected to work.
Thanks in advance for your work on this and everything else you guys do to make this thing awesome.