Foreign addresses in office 365 account?

Copper Contributor

I recently logged into a clients O365 account as the admin to enable multi-factor authentication for them. While I see all the users listed there, mixed in are about 20 other email addresses. People that i believe they email with but why are they listed in our O365 account in that area?
for example if the domain is i see a list like this:

Why are these names in there? They are not there when going to ACTIVE USERS.
How do I remove them?

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