Your instructor needs to see how you respond to a variety of challenges.
 Can you handle difficult students?
 Do you work well under pressure?
 Are you organised?
 Can you articulate well?
 Are you capable of conveying complex information in a differentiated fashion?

 The instructor needs a good measure of your character before committing to training you.
 If you are not suitable, then instructing is not for you.
  

Long-distance tai chi instructor courses are absurd.
How can anybody learn the necessary teaching qualities from long-distance learning?
It is simply ridiculous.

Only the most desperate and naive individual would seek to undertake such a course.
The qualification is not worth the paper it is written on.
Any insurance company that provides personal liability cover based on such a course is negligent.