Could not assign applications to your account

Same here,

I have a brand new MacBook Pro and I can't update iMovie, Pages, Numbers, Keynote and GarageBand.

I'm using the same Apple ID since my first MacBook in 2010...

This message is basically directly related to the payment method that is linked to your Apple ID. This message will appear if you have an unpaid balance on your account or the payment method itself is invalid (for any reason).

To stop these message, you will need to update your payment method. You can either provide a valid payment method or choose "none" to not associate any payment details with your Apple ID. However, you will not be able to choose "none" if there is a payment due or you have enabled Family Sharing on your device.

• Payment methods you can use with your Apple ID- Apple Support
• If your payment method is declined, or you have billing issue with a previous purchase in the iTunes Store- Apple Support
• Change or remove your Apple ID payment information- Apple Support
• Create or use your Apple ID without a payment method- Apple Support
• If you can't choose None when you edit your Apple ID payment information- Apple Support

That happened to me when I got my latest computer. Call Apple Support. After explaining my problem, I was transferred to a level 2 support person who got me download codes for the applications. I then went to the App Store and at the top right entered the codes under redeem. I was able to download the applications using my Apple ID.

Apple Support Contact

Work through the screens to get an email or chat option.

Apple Support by e-mail or chat

If it isn't a billing error, are these applications that you downloaded using your old ID? They can't be transferred to your new ID.

I tried again today.

After disconnecting and signing in to the App Store app the click to the "Accept" button worked with no error.

My apps are updated now.

Good.