Occasional Contributor

We have our tenant open so that we can message users from other tenants as we work on projects. Recently on of our users has noticed that when they add external users as contacts, they're showing up as their UPN, rather than their primary SMPT or their contact name. 

 

I would normally post pictures of this but I don't want to reveal anyone's UPN. Has anyone else experienced this? If so, were you able to resolve the issue or have users just gotten used to it?

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