Normally we get a lot of input, support, and energy from non-verbal communication.
Imagine a normal exam situation, where you meet your peers outside the examination classroom. They are smiling at you, maybe giving you a hug. You all share and feel the energy in the waiting area. When your examiners invite you in, they also smile and ask you how you are doing - all to make you feel comfortable.During an online oral examination they will support you with small nods and use their body language to encourage you to go on.
These small non-verbal elements are challenged in the online setting. It is very hard for you to ‘read’ your examiners, and you will not experience the same energy or nonverbal support as you are used to. Not because your examiners are not up for it, simple because this is very difficult online.