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The Email one-time passcode feature is enabled by default for all tenants now. That explains the code being sent. It's for those not using a Microsoft identity so they don't have to create a new Microsoft account to access another tenant, but still have a guest account created in the resource (inviting) org.
You cannot manage anything through the admin centers as you mention using Teams free (classic), but you can access https://portal.azure.com/ and manage your tenant. Just sign in with your account associated with the Teams free admin account.
Bear in mind Microsoft has moved away from the "classic" orgs. and they cannot be created anymore. So, Teams free today is something different as you might have noticed.As for the issue, it’s most likely cached credentials. Have him use InPrivate mode or Incognito. Or clear the Teams cache by signing out manually/quit the app.
Hope it helps!
The Email one-time passcode feature is enabled by default for all tenants now. That explains the code being sent. It's for those not using a Microsoft identity so they don't have to create a new Microsoft account to access another tenant, but still have a guest account created in the resource (inviting) org.
You cannot manage anything through the admin centers as you mention using Teams free (classic), but you can access https://portal.azure.com/ and manage your tenant. Just sign in with your account associated with the Teams free admin account.
Bear in mind Microsoft has moved away from the "classic" orgs. and they cannot be created anymore. So, Teams free today is something different as you might have noticed.
As for the issue, it’s most likely cached credentials. Have him use InPrivate mode or Incognito. Or clear the Teams cache by signing out manually/quit the app.
Hope it helps!