Training plan issues

Hi everyone or anyone, is there a problem with the training plans. I have been doing the dirt Destroyer training plan, when a session becomes available it gives me a particular timed count down to when the next session should be completed by. I completed my second to last training session (nearly 6 weeks In) yesterday and my final session gave me a count down to be completed for tomorrow evening (today) , I logged in today to finish the final session of the training plan to find that it isnt allowing me to complete it, it doesnt even give me the chance to click " I DID IT" , I am so annoyed because I have been working towards this to complete and now nothing, absolutely gutted. Can anyone help or explain…