Why can't I push to my own repository?

Question

git

I used to work on one computer and now I work on another. And on the computer I'm currently working on, I can't push into the repository.
I did standard operations:
ssh-keygen -t rsa -C 'my_email'
and inserted the contents of the rsa.pub key into ssh keys on the githab website.
And one more thing:
ssh-add rsa
But before pushing git asks me for my name and password. 100% I enter everything correctly.
But they still write to me - Invalid username or password and Authentication failed for the address of my repository.
The only thing that can be - is Two-factor Authentication (recently enabled) - does not let me push.
What to do?
Thanks to all.

Answer 1

git remote show origin

Answer 2

Check the key, the rights to the key. They should be 600 for the private key.