URL：https://learn.microsoft.com/en-au/dynamics365/sales/teams-integration/using-teams-chat-in-dynamics#start-a-connected-teams-chat-in-dynamics-365

When Teams chat is enabled in Dynamics 365, the current functionality only allows searching for chat participants by "name." If it were possible to search by email address as well, it would greatly enhance the efficiency of finding participants.

We strongly hope for this feature to be implemented.