Running program as a Service with User Login to access NAS

I'm trying to run an application as a Service that runs on startup (Windows 10 Home). The application should be run as a specific user, and I've set that information within properties login information (and checked that the username and password are correct). I am doing this so that the application will have access to a network drive (NAS) with the same username/password. However, when I startup the application runs but it does not provide direct access to the NAS. If I run the service manually, I have the same issue. I've also tried with Automatic (Delayed) startup for the service, but that doesn't work either. If I stop the service, and run the program manually, then it does obtain access to the NAS; which to me means that my windows user login information matches the NAS authentication. Any help on diagnosing this issue would be appreciated.