VS2019 install error

Hi All,
I am trying to install an app written in Visual Basic - Visual studio 2019 and am getting as system.io.ioexception "The user name or password is incorrect". I can publish the app and install it on my PC, but it fails when trying to install it on a different PC. The code is being published to a Synology NAS server with a file path of \NAS2\Public\Software\MyApp The users PC has recently been upgraded and uses a PIN number, which doesn't match their credentials on the NAS2 server. I have tried mapping the drive to the publishing path with my credentials but am still receiving the same error. The app connects to a Microsoft access database with a connection string of "ConnectionString" Provider=Microsoft.ACE.OLEDB.12.0;Data Source=\NAS2\APDOCS\Database\SCANDB.mdb. I'd appreciate any advice on where to look for examples on how to get this working.
Thanks !!