Why can’t i download an app with my password
I cannot download an app with my password and can’t update an app with my password too.
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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 that you use to sign in here?
See -> If you can't connect or sign in to iCloud
If you can't connect or sign in to iCloud - Apple Support
See this Apple article: If you forgot your Apple ID password
If you forgot your Apple ID password - Apple Support
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
Keep in mind if you can't make purchases or update apps, including free apps, you need to update your payment method or add a new one.