MessengerPeople interview questions

Initial call with external recruiter. Then they said they want to skip initial step and go to the test task. And I got email with code task requirements. I am pretty confident I did code task very well. I have dockerised solution and covered 100 percent with unit tests with various cases. Solution works for all cases. But then After 8 days submitting task and asking several times about feedback. I got rejection with no details. I asked for technical feedback, and I could not get anything.