In practice mission 1, when I connect to the tanker, the instructor says "there you go ! contact !" and then "well done".
However in practice mission 2, when I connect to the tanker, the instructor says nothing. After I completed 6 refuelings lasting 15+ seconds each, he still says nothing. When I left the tanker, he says "Are you giving up?". After I landed and shut down, he says "Well, you did poorly".
How to get him to recognise the contact?