might be good to to reach out to Espin customer support and report back on their diagnosis.So at first the noise was only when pedaling... and seemed more near the crank, but later it developed a second noise which is closer to the rear and it continues even when not pedaling.
I had a guy come over yesterday and adjust the derailleurs and check the crank and the rear hub and he doesn't know where the sound is coming from (the rear hub sound didn't happen until this morning's ride).