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Multiple Users in Microsoft Teams (and other Office 365 services) with the same name

Recently a colleague asked me: How can you deal with users in large Enterprise Tenants, who share the same name? How do you know who is who?” Indeed, this can happen, as soon as your Office 365 Tenant has a lot of users in it. There are some very common names in each language, so you should know who you add to your Microsoft Team. From an organizational perspective, this should be solved with a proper identity management: Users have a unique e-mail address, but it does not end here: there are some other fields that need to be filled, like Job Title, Department and a lot more. But in fact: which fields is the Microsoft Teams user dialog using here?