I have the same problem and posted about it previously.  I cannot access my relay on Start9 while using iOS Primal because it won’t accept the ws:// address.  If you try iOS Damus you will be able to add the ws:// address then use your relay with Orbot running.  I hope that changes are made in Primal because it’s still my preferred client right now. My work around is to use Damus and Orbot when I want to post then go back to Primal when just looking around.