Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello,
Sign into the Microsoft apps on your iPhone with the Microsoft account that is covered by the Family plan, then stop the old Personal plan so you are not double-billed.
Do this:
First, make sure your Microsoft account is included in the Family subscription. If you are the owner, you can share it with your own Microsoft account or confirm it is already assigned. If someone else is the owner, ask them to share the subscription to the exact email you will use to sign in on the iPhone, then accept the invite.
Next, cancel the expiring Personal subscription on the iPhone so it does not renew. Open Settings on iPhone. Tap your name. Tap Subscriptions. Tap Microsoft 365 or Office. Tap Cancel subscription. You will keep access until the listed expiry date.
Now switch the apps to your Family-licensed account. Open the Microsoft 365 app on the iPhone. Tap the profile icon or Me. Tap Sign out, then confirm. Tap sign in and enter the Microsoft account that is on the Family subscription. Repeat the same sign-out and sign-in in Word, Excel, PowerPoint, OneDrive, and Outlook if you use them, so every app picks up the Family license.
If an app still shows prompts to upgrade or still says Personal after a proper sign-in, delete that app and install it again from the App Store, then sign in with the Family-licensed account on first launch.
To verify it worked, open the Microsoft 365 app. Go to Me, then check your subscription. It should show Microsoft 365 Family and premium features should be available in Word or Excel without upgrade banners.
If your old Personal plan was bought directly from Microsoft instead of the App Store, also turn off recurring billing for that plan at Services and subscriptions on your Microsoft account in a web browser.
Try those steps and tell me exactly what the Microsoft 365 app shows under Me > Subscription if anything does not match.