Changing of Apple ID at App Store
I actually can update any app due to the fact that I changed my iCloud on this device
Any time I want to update any app it takes me back to the first iCloud on this device which has been changed
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If you truly changed the email address on the same ID then it should be no problem updating the apps. If you instead created a brand new account in order to "change ID" then that was a mistake. The apps can only be updated while signed into the account that downloaded them originally.