Problem joining github classroom?

I keep trying to join a github class, but I continue getting this error:

My teacher told me he fixed it and he and the other students have no issue joining, but for some reason, I still cannot join… I tried using a different browser and a different computer, but the error persisted.

Is it something wrong with my github account?

@skyvale Weird!
Do you have confirmation of the class name, date, cost and website?

Yup, the link I clicked to join the GitHub class was directly from the class website itself! It’s for my college course, which I am already enrolled in.