How do you change from one github connection to another?

One student is connected to the wrong github account (it comes from back in the before-covid times and they shared a seat one period after each other) and somehow, they connected.

Although on the Account tab, when you go to Connected Services, you CAN disconnect from Github.... if you click reconnect, it just automatically goes back to the SAME Github account. It gives you no option to reconnect.

PLEASE HELP