Zwift Challenges unlocking

Hi. I’ve completed the 3 challenges that are unlocked on Zwift. There seems to be another challenge that is locked. I thought this would automatically unlock once the first 3 have been completed. Is there a way of unlocking the next challenge as I feel I am wasting miles/elevation at the minute? Thanks

There is no 4th challenge… nor has there ever been.

Ok thanks for that just thought I’d check