When checking the challenge answer, even the example link is not acceptable. There is some problem in checking the challenge:
https://www.freeco___decamp.org/english/learn/information-security/information-security-projects/anonymous-message-board
Take the test with the original link: https://anonymous-message-board.freec____odecamp.rocks/ and you will see that there is an error in checking the challenge.
I believe that in addition to the existing error, the timeout is also short.
To simulate, remove the underlines from the links.