Hi Merlin,
1. Is this process reading the first name and the last name from the Project Contact field?
- Yes.
2. Does "Project Contact's Email" refer to the contact's mailbox?
If so, we can create an email field which is calculated and set it as the first name and the last name.
Here we have to go to https://make.powerapps.com/ to create an email field, because the classic customizations do not have field data type "Email".
In the powerapps maker, select the D356 environment, go to Data > Entities, find and open "Project Follow-Up", then add a field.

Select data type to Email, then Add > Calculation. Save.

In the new window, set as follow.

