In the App Store
How can I update any of my apps when the password I type in is not accepted? It keeps saying that it is incorrect but it's not
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Top-ranking reply
Have you recently changed your password?
If so, then see this Apple article: What to do after you change your Apple ID or password
What to do after you change your Apple ID or password - Apple Support
BTW:
You are sign in here . . . with your Apple ID & Password.
Your Apple ID is the personal account you use with all Apple products and services. It includes the email address and password you use to sign in, as well as the contact, payment, and security details that you use with Apple.
You can’t merge multiple Apple ID accounts.
What happens when you use the same Apple ID & Password that you use to sign in here?