They surely can, but if the interviewee knows his current setup from his/her existing income means the connection may not be stable. The interviewee can * Emai

They surely can, but if the interviewee knows his current setup from his/her existing income means the connection may not be stable. The interviewee can * Email upfront to inform about the situation * Trying to go to other places with more stable connectivity. and others. As xyzelement said, an interviewer, which I am as well, evaluate multiple signals at the sametime, how resourceful, or how the candidate solve a problem, is one of the soft skill that is required.