This is new machine with fresh install of Git.
> git --version
git version 2.19.1.windows.1
I cloned repo using https. Every time when I try
One of the reasons for this could be password changes for git(and other similar version control systems).
I can recommend a couple of solutions
As mentioned by @mpro, you will be asking to use the credentials stored on the windows credential manager. You would like to update your password accordingly there.
The way you can reach that point is(in WIN 10): Start -> Control Panel -> Control Panel -> Credential Manager
On the contrary you can ask git to use credentials from its cache by using the following command
git config --global credential.helper cache
By doing this, git will prompt for the username and password at each interaction with the remote origin.
Hope this helps!