I did a CoderPad interview one week ago. Both me and the interviewer were working from home (as everyone else, I guess). From my point of view, it was a great experience. I could google how to sort a dictionary in python, and use it right away. It was a workflow just like a regular day at work. You don't know a small syntax details, you google it, use it, and move on with your life. A whiteboard doesn't allow this. It looks like the interviewer was happy with my performance, I got scheduled for a follow-up. Wish me luck :)
There are several virtual whiteboards to choose from