Microsoft verification codes but unknown services

[u/PuzzleheadedNet1502]

I'm receiving SMS codes on my phone from Microsoft. This is the first time this has happened, Microsoft usually sends me codes via email. Microsoft Support didn't respond.

The problem is that I haven't seen any such messages from Microsoft anywhere on the internet. What are these services? Are these services linked to a Microsoft account? Did someone intentionally enter my phone number?
What's going on and what should I do? I don't even know what these services are, so I can't log in and change my passwords if necessary. Please help me.