TLDR don’t swap covenants right now. Due to a bug I cannot complete the first chapter of the covenant campaign since it requires you to do quests for Ven’ari that I already did as a Venthyr.
So right now I am stuck behind a level on renown and missing the legs appearance for the covenant transmog set.
I posted it in the bug report forums, but let’s face it, blizzard doesn’t check those forums, and I found a few other people in a similar boat.