It's hard to explain, but owners with hitch cover will easily understand.
There grommets which easily fall out when hitch cover is removed. It's was very difficult to snap cover snaps in place without those grommet falling out.
Any ideas how to make these grommet stay better (zip ties, glue, etc)?
You'll possibly remember I mentioned that about five minutes after the first one hit the ground here. Not sure which thread that was in.
What you have to do is simply be careful when putting the cover back on for now. Take your time, pull the cover out a little at the bottom where the latch screws go on, then reach up underneath to make sure the clips are in position. Then simply spin the latch screws until they line up - they'll only go in one way - and tighten. Or you roll onto your back, lay down, and reach up there to make sure they're in place. Or you just pull the cover off and leave it off.
Subaru is aware of the issue with those grommets, there was a QMR started again, about five minutes after the first one hit the ground here (I know, my service tech was bombarded with e-mails from Subaru about it). There will probably be a redesign and a fix issued at some point, but it will take time for them to figure it out.
So honestly, just don't slam it back into place and pull out a little on the bottom so the pointy part of the screws don't know those grommets off, and it'll work fine.