App store
Why does my app store not let me log in to my account? It keeps saying that my password is incorrect even though I have changed it multiple times to make sure it’s correct.
iPad Pro, iPadOS 15
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It keeps saying that my password is incorrect even though I have changed it multiple times to make sure it’s correct.
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.