Send Email To Specific User In Group With Assignments

If I understand correctly, the assignment is assigned to a group at the Flow level, but you want to notify a specific person. In the Flow Designer, choose the assignment step and navigate to the ON STEP RUN section of the properties.

Choose SharedFlow and create a new flow with a Send Email step with the specific users information.

See the Decisions documentation here: https://documentation.decisions.com/v8/docs/en/assignment-settings?#on-step-run-and-auto-complete-step