Login Credential being asked when I try to access my Main Computer with a new Computer over a common network

[Microsoft Windows]

I recently purchased a new desktop system with Windows 11 for my office. I have a few more systems in the office out of which one system has all the major files and it is accessed by other desktops over a common network. My new Desktop is not able to access the Main Computer (Which has all the files) when I type the IP Address (\\192. etc) and it asks for credentials (which I never made/know). All my previous systems are able to access the main computer without any password. Also, the main computer has Password turned to OFF in Advanced Network Settings. Kindly advise.

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