adding husband's iPhone to my apple account

wandafrommo wrote:

trying to add my husband's phone to my apple account

Once you succeed in doing that, you’ll next have an ongoing adventure awaiting you untangling everything that then gets blended together including calendars and photos and passwords and preferences settings and phone call logs, and whatever else Apple adds for sharing during future upgrades.

And this is before discussing the opportunities for mayhem that can arise with shared accounts, whether that accidental or deliberate.

Or you can continue to use unique accounts, and set up Family Sharing, as is usually recommended by Apple.

Overview of: Family Sharing - Apple

Accounts are designed for use by a single person. If you share an account you will be sharing everything with each other and little possibility to keep things separated. Read the links provided in previous posts about Apple's take on sharing accounts, and how to optimize multiple accounts in a Family by using Family Sharing.

On the off chance that you are referring to adding your husband's iPhone to your Applecare One coverage, that is not possible unless both devices are signed in under your account.

Hello~ I would recommend that you click on the Apple article below and review…

Make sure that each family member has a unique Apple Account - Apple Support

~Katana-San~