For the last three weeks I have been using the OSX keychain to manage my GitHub credentials. Whenever I need to pull in an update, I do the usual:
git pull origin master
With this command, the keychain then pops up and requests my password, which I type, and then the command that was entered in the command line executes.
Suddenly this morning, I go to pull in another change, and it now asks in the command line for my user name and password. Then I get the usual error:
remote: Support for password authentication was removed on August 13, 2021. Please use a personal access token instead.
remote: Please see https://github.blog/2020-12-15-token-authentication-requirements-for-git-operations/ for more information.
I have worked on this for some time and don't get why the methods in other questions aren't working. I have followed these other posts with no luck
First, this has nothing to do with ssh-add, used to cache private SSH key passphrase.
Second, this has to do with GitHub new policy: Git password authentication is shutting down.
You need to use a PAT (Personal Access Token) instead of your GitHub account password, as described in "Dealing With GitHub Password Authentication Deprecation" by Antonello Zanini, and described here.