Attempting to map a drive gives you the error: An extended error has occurred

Users that use local accounts to access the share would not usually get this error and although I found that some users resolved this by disabling SMB signing or authentication methods, I found this to be related to the Active Directory setting "Log On To", which can be configured for each Active Directory user.

If you use this feature to restrict users from accessing any servers/computers that they are not allowed to and you do not include the users workstation/computer name in that list, the user will get this weird error.

So either add the workstation that the user uses to access the file share or do not use the "Log On To" feature if you do not need to use it.