Beginning to look like VMware has still not learned its lesson on the complex password requirements of the real world.
Back on VI3, if you added some infrastructure components the authentication credentials you gave the installer had to have a simple (no special characters) password. Naturally for any half decent data centres this is rubbish, and caused all sorts of administration problems as you set up a special account that circumvents password policy just to get the software installed.
Well, I'm in the midst of vSphere upgrades and it seems like this is still the case. Guided Consolidator and Convertor have not yet installed with good, secure passwords on the credentials. Experimenting with fixes (Google's not yet found an exact match to the errors).
I'll report back later, but if this is the case, then shame on you VMware.