Hi JC,
If you can see the B2 music files from your phone/tablet then that means that NAS is running correctly on the B2. It also means that the problem lies within the PC. With Windows or Mac, the NAS access should be available within 30 minutes or less, typically 10 minutes or so.
Windows 10 may need some setup adjustments to enable it to work with NAS. Let us know what version of Windows/MacOSX you are using.
Regards,
Peter.