I am similarily having the same problem on a LG G6 ThinQ. I opened a new card from Walmart, same issue.
I've tried on 2 512GB (1 2 years old, 1 new) cards and a 32GB (year old) card. I likewise couldn't move the apps on any of them. I look forward to seeing someone solve this issue on some device and see if I can replicate their steps on my device. Seeing as it is cross manufacturer issue, it might have to do with the current build of android.