Apple ID and password
I have changed my Id and password but it’s always asking for the old id and password during app download and updates
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There are a few steps you'll have to make after changing the Mail Address for your Apple ID:
What to do after you change your Apple ID or password - Apple Support
If you have created a completely new Apple ID, you will have to fill in the old Apple ID and password every time you want to update those app purchases from the old Apple ID. Purchases can't be transferred to another, different Apple ID.