tygb Said:
Q1: "In system preferences > network are your settings according to it , do you know wireless network password , is air port router also configured or not ."
A1: The SSID shows, the password is correct, they don't use AirPort devices (though I do). Still trying to figure out why I got the log in success, though I am not connected.
Q2: "Have you ever tried to delete all network settings and once again configure , steps are very easy but before that wireless network password is essential , it can be obtained from keychain access https://support.apple.com/en-in/guide/keychain-access/kyca1085/mac"
A2: Tried to reconfiguring it all, having deleted all settings. But, no success. Did a TMB backup and restoration to get it back (that's why took a bit for a reply). Everything is back as to how it was. Restarted my Mac, and when I get back to where I was before work, all is fine. I think it has to do with the ISP and the company's service - lots of security measures are taking part in the server's location today and tonight (due to current events). So, security may need to be reset.