B737 MAX 8 First Officer reported a Flight Attendant notified the Captain of a burning electrical odor in the cabin. Flight crew diverted and landed safely.

Narrative

On climbout from ZZZ the Flight Attendants called around 9;000 ft. and notified the Captain of a strong smell in the middle of the cabin. They described it as a burning electrical or burning plastic smell. I was PF (Pilot Flying). After the Captain spoke with the Flight Attendants; he determined we needed to run the Fire Smoke and Fumes Immediate Acton Items and QRC/QRH. We donned the O2 masks and established communications quickly; and I took over the radios so the Captain could run checklists. We leveled around 13;000 ft. and notified ATC we were working on a problem. Roughly halfway through the QRH Checklist; the Fas (Flight Attendants) called back to tell us the smell was now gone and there was never any smoke in the cabin; just the smell. We determined it was safe to get off the O2 masks and continued our climb while finishing checklists; talking to Dispatch and determining our next course of action.We initially thought we could continue; based on 'Captains Discretion' mentioned in the checklist. After looking into the QHR more; and speaking with the Cabin Crew; we determined we could not locate the source of the fumes; and therefore needed to divert. ZZZ1 was the nearest suitable; and after notifying Dispatch we initiated a divert to ZZZ1. We landed normally; but on taxi in the smell returned; and at the gate was evident in the Flight Deck as well. We deplaned Passengers quickly but did not feel the need to declare an emergency with ATC or notify ARFF (Airport Rescue and Firefighting) because there was no smoke or fire apparent anywhere. After talking with the Flight Attendants after the flight; they mentioned the smell was accompanied by a loud uncharacteristic noise when the flaps were extending or retracting.