I can answer this after about 7 days and over 15 hours on the phone with customer support.
You CAN NOT set the DAP1522 to wireless in the 5GHZ mode as a wireless bridge. PERIOD
They will tell you that if you are trying todo that; you bought it for the wrong reason. You can argue; that was what it is marketed/sold as.
To use it in 5GHz mode, you MUST run a hardwire from the DAP1522 TO your router.
So if your like me and possibly 99% of the other customers, this now works worse than their older 634 routers that ran @108 speeds. It will NOT wirelessly connect to a DIR855/625/525 router as a 5GHz connection.
To reinterate: if using the 5GHz mode, you will have to set it as ACCESS POINT and hardwire a cat5e cable TO the router. Otherwise you will just be left using the 2.4GHz mode wirelessly.