There were issues when they first added Heavansward to PSN in regadrs to those who did the Free Upgrade> PS4 and it has now been resolved.
I am not 100% certain about the service account so unfortunately i am of no help there.
Also not certain if you care or not but because you purchased the full version, this does not come with the early access. Or at least i had read so somewheres.
Hopefully someone can have an answer for you