If you have purchased a Any Standard Conqueror Challenge join code, when you redeem this join code in the App you will see all other the challenges that are available to be joined with this join code.
If the challenge that you want to join is not in the list it is because is not a standard conqueror challenge.
Challenges that are excluded are:
Licensed challenges - as we need to only allow people to join with join codes that they have purchased for the specific licensed series.
Virtual races - where we need to order medals based on the amount of race join codes purchased.