We had the same problem the day after having the washer/dryer installed in our new house. Did some YouTube sleuthing and got lucky..when I checked it the washer hose was stuffed far into the drain line and likely was at or very near the P trap. The pumps in the new machines are much more powerful than ever and shoot out quite a bit of water during the draining cycles. I assume the trap was empty of water during the drain cycle which caused a horrible sewer smell in the house and especially just outside one of the sliders. I pulled out the hose and cut 3' off of it and re-inserted and secured it into the drain pipe - problem solved. I have a feeling this might be a fairly common issue.
Good luck
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