Can somebody PLEASE help me understand github personal access tokens, and why I can't get them to persist?

Hello

I'm at the end of my rope with Github personal access tokens. I don't know why, but every single day I have to create two new access tokens to push my updates.  Should they not persist?  Is there something that I'm not understanding?

Here is some more info:

- I manage two different projects on github, each with their own separate repositories and logins

- I work from two different computers, sometimes from my laptop, sometimes from my desktop

Most days when I go to push changes, authentication fails due to the access token and I must generate another.  I have dozens and dozens of them now!  If I work on only one project, from only one computer - that specific access token seems to work well day after day.   But it I open the other project in PyCharm, it all goes to hell (or if I work on day on my desktop, then the next day on my laptop, authentication always fails) .  I have literally tried everything..  Doing one access token per login and putting it on both machines.. Making 4 different access tokens (2 machines and 2 repositories)..  Nothing seems to work!  As soon as I use the other machine, or switch projects, it all just stops working and I have to create yet another access token. I simply don't get why it isn't working.  

Any insight would be most appreciated!