@ZOS_GinaBruno, I have created several tickets for this issue. I currently have a level 10 Dunmer NB that I have been trying to turn into a vampire. I have had several guildies and randoms try to bite me and all have received the same issue. The bite synergy appears, but they are unable to click it. I am not currently a WW and I am sure that all the people who have tried to bite me have a bite available.
I have had other toons bitten at level 10 in the past so I am curious if this is a random bug on this toon or if there was some unstated patch that changed the minimum level for vamp bites.
Dinosaur Chicken Nuggets - Argonian mNB Tank/Heals (PVP)
Strawberry Semifreddo - Dunmer mSorc DPS // Sunny D-Light - Breton mTemp Heals
Peanut Butter Sandwich - Orc sDK DPS // Kellogg's Frosted Flakes - Argonian mWard Tank/Heals (PVE)
Cor-Leonis
friendship - integrity - perseverance