To not want to do this?

[Januarypip]

Currently covid positive and feeling pretty unwell. I've got an underlying health condition although work may not know this.

Due to finish isolation at the weekend unless I test negative which currently seems unlikely.

Work have asked me to do a 30 minute teams call on Wednesday.

They are aware I'm still feeling unwell although maybe not how bad.

Thing is no one else can stand in for me as the call relates to an audit and my specific role. I could do it but really don't feel well still & I'll have to get dressed etc

AIBU to say no?
Or should I just suck it up and get on with it?

Can you not just tell them you're off sick and are unwell? Can it be done at a later date?

Well, you are off sick therefore not able to / obliged to take part in any calls or meetings. Why is postponing the meeting not an option? Or is it the case that your employer just doesn't want to post opine?

postpone *