Student -Late Registration

[Gershwin]

I have already completed the registration process and started the class. Now I  discovered that there are three additional students who need to be included. However, the system is currently preventing me from registering them. Is there a solution to this issue?

Thank!

[Gabriel33]

Is this in the Free for Teacher Canvas? It seems to be the same issue in this other post and this one with more replies, and I could also replicate it there.

I could not replicate it in my University's Canvas.