Hi Brent, thanks for you question on Workforce.
Workforce supports a single Project Owner at this time; i.e. is it not possible to have multiple project owners \ users who can change the project through the Workforce application.
I've added your information to the issue in our backlog requesting this capability.
Depending on your situation, the following trouble shooting article may help you:
Troubleshooting for project owners—Workforce for ArcGIS | ArcGIS