Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello
Subscriptions cannot be combined. You would need to decide which one to keep and then cancel the other one.
To cancel, Please go to https://account.live.com
Sign into your Microsoft account. Then go to Services. Click on Manage for the subscription plan you want to cancel.
You also cannot sign up for an additional family plan on top of a personal plan in the same account, basically they cannot be stacked.