Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
I get that type of email every week - dozens of them. I'm being charged some crazy amount for an unpaid account or something I didn't buy, etc. etc. They are all scams, which I'll explain below.
FIRST, I know for a fact that my subscriptions with Microsoft are up to date and paid in full. I can easily confirm this at any time. That's how I know these messages are scams the minute I see them.
If you aren't sure what you purchased from Microsoft (or anybody else) and whether your subscriptions are paid up, you need to find out. In your case, you didn't subscribe to a Microsoft 365 plan in the first place, so you know that this message is phony right out of the gate.
SECOND, for fun, I rest my mouse pointer (never click) on the name of the sender. That pops up a small window that shows you the sender's real address. That's the other way I know it's a scam as soon as I see it.
WHY DO YOU RECEIVE THEM? The sender has no idea who you are or whether your subscriptions are unpaid. You are just one of thousands of email addresses that received the same spam. The sender wants to alarm you, so that you'll open the message, which gives the sender an opportunity to phish your account's username and password.
This points out another advantage of a passkey over a username/password combination. With a passkey, there is nothing you need to enter to be signed in to a website, so there's nothing that can be stolen from you (or forgotten.)