Workflow not attached when Public Users submit request

Hello. I have a service that allows public requesters. When the ticket is created by a signed-in user or through TDNext, the correct workflow is attached.  However, when a public user submits a ticket, the workflow is not attached. 

Also, once the user-generated by the public user is created, the workflow cannot be manually attached through the Actions operation.

Can you provide some guidance?

Thanks, Tevis