You were scheduled for citizenship test from April 15 to May 5? That does not mean it was updated on April 15. What is the Last Updated: date in the upper right corner of your tracker?
I also received a test invitation email after April 12, but emails are not important, the question is did the tracker update after April 12 for anyone or did the IRCC break it after the SSL screwup?
My family member received a response today to a web form that was sent 45 days ago. They already became a citizen and received their citizenship certificate during that time, useless web form!
It takes about 1 month for them put your application into the system, and another 1+ month to read your urgent processing request web form with no guarantee that they will accept it. Go send a paper application with urgent processing written on it if you want it faster.
They think their processing office is Sydney because they sent it there and it is the first office in GCMS notes before the local office starts doing work.