Connection help – E-bike to trailer

I am at my wits end trying to figure this out and my LBS also has not figured out the answer yet.

I have a Burley D’Lite X single trailer, which we currently use with the standard included hitch on the quick release axles of our Giant hybrid bikes.

I just bought a Trek FX2 Stagger at a LBS, where the staff assured me there would be a way to get my bike trailer connected to the e-bike; however, they have since told me that the solution they thought they had, won’t work and are looking for options, but so far they haven’t come up with anything and I would really like to start commuting on my new bike, but I can’t do it unless I can haul my preschooler in the (very expensive; very nice) trailer we already have.

I am not mechanically inclined and looking at all the adaptors and trying to figure out what I would need with the bike and trailer I have is just confusing me at this point. Can anyone help?