I and got my bag back at EDI today. Managed to find a very helpful Menzie's agent who went airside to pick it up from baggage claim, where it has sat since last night (per AirTag) and the Menzie's agent. Wasn't "put in the system [by BA?]" which is why no tracking number could be provided to me over the phone this morning or at the baggage office last night... which is why I went back to EDI today.