Hello Quantumlip,
I'm John an Independent Advisor and a Microsoft user like you. I am here to work with you in this issue and I'll be glad to help you. With regards with your concern,
On the mapped drive, Did you try to disconnect then mapped the drive again. Put a check on the "Connect using a different credential"
or
Press Start then search Control Panel.
Select User Accounts.
Click Manage your Credentials or Credential Manager.
In the Windows Credentials and Generic Credentials section, remove any stored credentials referencing shares, network drives or similar: Click (Details).
Click Remove then Hit Yes on the dialog box
Repeat these steps until you remove all of the credentials associated with network shares.
Close the Control Panel window.
I hope this helps! Please let me know if you have any further concerns.
Sincerely
John DeV
Independent Advisor