Update:
I was able to get into SDDC Manager by using the following process (still not official root cause):
- Attempt login and get the blank white screen with the URL path of /ui/api/internal/login/callback.
- Wait a couple of minutes and do a refresh on the browser and SDDC Manager should let you in.
For some reason if you refresh too quickly or try other things to get into the main URL you will get the white screen.
