I'm using Alby and I am signed in. Just can't remember how I initially signed in. Let me test

Ok so clear your cache and cookies in the browser you're using. Make sure to clear it for time range 'All time'. Also, in Alby, go to your connected sites and make sure Primal isn't on that list. If it is for whatever reason choose the gear next to it and hit delete.

After you do these things open Primal in a new tab and Alby should pick it up and ask you to approve log in

Working just fine for me with Alby’s extension