Why I keep seein the old Apple ID to make updates.
Why I keep seein the old Apple ID when app need updates?
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Those purchases are tied to the other ID and can't be transferred. One option is to delete the apps/purchases made by the other ID and download them using the new ID if desired. If necessary, check your purchases history to see which apps/purchases weren’t made by the current ID.
Or you can try to set up Family Sharing to keep access to your purchases.