Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
You do not need two Subscriptions to Microsoft 365, the subscription you keep depends on your requirements.
1
Microsoft 365 Basic only entitles you to 100GB of OneDrive storage, it does not include installing the Office apps on your devices.
2
The Microsoft 365 Personal subscription entitles you to install the Office apps on your devices (5 devices logged into at the same time) and you also get 1TB of OneDrive storage.
3
Log into your Microsoft account on this link (https://account.microsoft.com/services/), if you find two separate subscriptions listed on your Microsoft account, to cancel the subscription you do not need, the steps are provided on this link:
https://support.microsoft.com/accounts-billing/subscriptions/cancel-a-microsoft-365-subscription