Do you have the same issue if you follow the OP’s steps to reproduce it?
• yes
Provide extra information to complete the original description of the issue:
• ATC advises me upon loading in that I need to acknowledge last transmission. Then asks me to rest my transponder to 3125. However I am unable to acknowledge any of the transmissions.
When I land and get to the hold short, i cannot acknowledge the taxi to parking instructions. Therefore i cannot complete the exam.