Hello CTFC,
Thank you for posting question on Microsoft Windows Forum!
Based on provided message "the username and password is incorrect" (even though they are correct.) after performing Windows update. Well! The problem might be a security protocol mismatch. The update likely changed how your workstation communicates to the server, making the server reject the handshake before it even looks at the password.
Since Windows updates might flip your network connection from Private to Public. If it is set to Public, Windows will block most file-sharing traffic for security. The suggestion here is to set it back to Private by going to Settings > Network & Internet > Ethernet (or Wi-Fi). Click on your connection and ensure the Network Profile is set to Private.
Another point worth mentioning here is of that Windows might be trying to use an old, cached version of your credentials that survived the update but might now be corrupted. On your affected workstation, Open the Control Panel and go to Credential Manager. Select Windows Credentials. Look for the server IP or name in the list. Remove it. Restart the computer and try to map the drive again. This forces a clean handshake. Also, after an update, Windows probably tries to authenticate using your local computer account like DESKTOP-123\User instead of the server account. When the login box pops up, type the username as ServerName\Username or ServerIP\Username. This explicitly tells the workstation to look at the server for the account, not itself.
Hope the provided information is helpful! If it is. It is appreciated to consider clicking "Accept Answer".