Shared Drive Credentials

I've been experimenting with setting up an old PC (running 10) as a NAS, and I've created a few shared drives with specific ones allowing access to specific users. Most of the shared drives will accept my login info, which is the exact same on my desktop (the client PC). This allows me to basically just access every share without mapping them when on VPN. However, one of my shared drives is not shared to that same username. When I try to map it with the different credentials, it fails because the other shares are mapped with my other credentials, and it's not letting me map one shared drive with different credentials then all the others? Does anyone know of a way to fix this?

Do you have the other user account set as an Administrator account. It won't let you set credentials to two separate accounts if one is administrator and the other is standard, if I'm understanding you correctly.