CasperLabs Rust Developer interview questions

The process took almost 2 months due to miscommunication between the company and a third-party recruitment company. The process consisted of 2 calls with the recruitment company, 2 calls with Casper Labs and a coding task. The task itself was quite easy, but waited 4 weeks for the feedback. I was asked if I used specific node for communication, because a reviewer could not find it. After I responded that I did, I got rejected without any feedback on the task itself, that was stated that was the reason of the rejection.