Q: I just purchased music on iTunes for my iPhone 6, and I tried downloading it, but this pop up kept popping up. Something about a 90 day wait.

Hi LostNative,

Thank you for visiting Apple Support Communities.

Although this is the only Apple ID you have ever put on your iPhone 6, it sounds like something is mixed up.

You can check which devices are associated with which Apple IDs.

Manage your associated devices in iTunes - Apple Support

See your associated devices

You can see the devices associated with your Apple ID in iTunes on your Mac or PC:

1. Click to open your account in iTunes, or use these steps:
   1. Open iTunes, choose Store > Sign In, then enter your Apple ID and password.
   2. Choose Store > View Account.
2. Click Manage Devices in the iTunes in the Cloud section. If you haven't associated any devices with your Apple ID, you won't see the Manage Devices section.

 

Next to each device, you can see when it associated with your Apple ID. You can also track how many days remain before you can associate your device with a different Apple ID.

You can also check which Apple ID was used to purchase the music with the song info as described here.

iTunes repeatedly prompts to authorize computer to play iTunes Store purchases - Apple Support

To determine which account was used to purchase an item, follow these steps:

1. Select a purchased song in your library and choose File > Get Info.
2. Click the Summary tab. Note the Account Name that appears in the list. This is the account name (Apple ID) you'll need to use when authorizing your computer to play this purchase.

Regards,

Nubz