I have changed both my ID and password, but when I try to download updates to apps, my old email account shows up and I can't sign in

I have changed both my ID and password, but when I try to download updates to apps, my old email account shows up and I can't sign in

That indicates that you have apps that need updating that were purchased with the account that comes up. When you have apps that need updating that were purchased from more than one account you have to update them one at a time until all the remaining apps were purchased by one account.
You have to log into the account that purchased an app in order to update it.

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