@apple502j Indeed as what you said, the vanilla datapack use string directly, which misled me
I still can't migrate, and it seemed that I'm not the only one who had this problem, I guess that might be caused by my xbox account containing Chinese characters?
yep, I still can't migrate my account, it outputs the same message.
[media]I find it when I make a datapack :L
can confirm in 24w45a