To be specific, each app knows what account was used to purchase it (regardless of what account is currently signed-in on the iPad).But bottom line ~ I can't update my apps because you can only have one Apple ID, and the update thingy on the iPad is recognizing my ID that I opened my account with.
i.e. the app knows its "owner".
So if you want to update a specific app, you need that app's "owner" to do so.
You have to use the account that was used to buy it to authorize the update.
I know this because of sharing apps with my friends.
I have them sign in with their accounts to download their apps onto my device, so that I have apps from 3 different accounts. But each app can only be updated by the account that owns it, so I have to ask them permission again to get an update.
I can't ever access that one again, as I deleted it and so now I have to delete all my apps that I bought with THAT ID and then re-install them.
Oh be careful with this step.
Did you have Apple transfer your purchases to the new account?
Because this is the only way you can change the apps' "owner" account.
Otherwise, this would be both pointless and dangerous.
For one, the apps will still be tied to their "owner" account (the old one), so reinstalling them would be pointless.
Two, you might end up not being able to reinstall them (at least, not directly from the store anyway, only the app "owner" can do that).
Well, you'd be able to if your PC was authorized, but as I said, they will still be tied to their "owner" account (the old one), so reinstalling them would be pointless.
Of course, all of this is moot if you managed to have Apple transfer all your purchases to your new email.
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