LR Mobile is not updated after Merging People

I do love the People View in LR and recently I made some "maintenance" in LR on my laptop - i.e. I merged 2 groups of pictures of the same person.  I also added some new pictures (including the same person).  It all seems to be updated correctly in LR on my laptop - and the number of pictures of this person is 2236.

However, it's not synced to LR mobile on iOS.  On my iPhone there are still 2 "groups" for the same person (with the same name), and the total number of pictures are 2061, i.e. the "new pcitures I recently added does not show up when I use the People filter.

I also tried a completely fresh installation of LR Mobile on my wife's iPhone - and there is the same issue: 2 groups of this person.

How do I "sync" the changes to People grouping (e.g. Merging People) on LR Cloud to my LR Mobile?