Houston wrote on Instagram that Harmon was in his early 30s, a graduate of Hillsong College, and a "vital part of our church in California.".
Before his death, Harmon made jokes about the virus on Twitter, including references to his decision not to get vaccinated.
On June 3, Harmon tweeted: "If you're having email problems, I feel bad for you, son.
Three days later, Harmon made another reference to being unvaccinated.
And, if you prefer, I'll identify as vaccinated, too," Harmon wrote
Makes total sense," Harmon tweeted on May 26
In the days that followed, Harmon wrote that his condition had improved, then worsened again