I just got this response from a ticket that was in for 3 weeks.
Greetings -,
We are aware of an issue where some Overwatch 2 skins have not yet been fully integrated into merged accounts. You can keep an eye on our Blue posts in the Forums for any updates here:
“Many players who merged their accounts should be seeing their full collections, but we still have a number of lingering accounts in queue to be resolved. Players affected by this have not lost any of their collection or progress.”
Game Masters are unable to grant missing skins in Overwatch, nor do we have any specific ETA on when the problem will be resolved. If you were affected by this bug, we would ask that you wait for a bug fix from our Devs. We apologize for any inconvenience.