Keychain Password

Login keychain password is same as the the admin password and always remembered by an administrator , it can't be viewed in keychain access , however can only be reset if one forgets it https://support.apple.com/en-in/HT202860

Have you set up iCloud Keychain , what are the versions of Mac , what does it mean admin password is not working can't you sign in and locked the account .

https://discussions.apple.com/docs/DOC-12712

I've tried my admin password and it is not working. This has happened on both my macbook pro (now) and my iMac (last week). Im not able to access things I would normally, I don't remember ever having this issue in the past.

both my 2018 MacBook Pro and my 2016 iMac are running 10.15.1, I know my admin password. When I got this box to enter login keychain password, I entered my admin password as it's the only one I've ever used. Didn't work. Apple Chat had me create a new keychain, and great now I have access to one thing, but the hundreds I had saved on the other keychain are gone.

if keychain access is opened through spotlight , and press command and comma to open keychain preferences , a pop up window appears , if reset my default keychain is clicked .

login keychain is deactivated as well as iCloud keychain , you have to again fill up the passwords using https://support.apple.com/en-in/guide/safari/ibrwa005/13.0/mac/10.15

in user library , in keychain primary folder a new key chain sub folder is created and the old sub keychain folder is deactivated ( you should never delete the old keychain sub folder from the user library ) .

The old passwords stored in keychain that you inquired will be definitely deleted , say if you had back up the Mac with time machine and you think by absorbing passwords from time machine back up and substituting them in user library > keychain folder is impossible , and passwords are encrypted you can't read them .