The Challenge was majorly hurt by the pandemic!
“The Challenge,” main struggle was finding a way to keep the cast safe as they all lived together and traveled to various locations.
Showrunner Emer Harkin told Variety in 2020 that everyone in the cast and crew had to quarantine before arrival and test negative every three days during the production of season 36, “The Challenge: Double Agents.” The crew took over an entire hotel and avoided the traditional finale location change, choosing instead to stay in Iceland for the entirety of the season. Per Insider
According to the showrunner, they had no positive COVID tests during filming. The testing is still going on now for the newer seasons.
With another pandemic happening, the problems is still present.