It was not a failure, it was by design
"During Arizona's primary elections, the RNC and Republican Party of Arizona's poll observer program documented and reported multiple failures by Pinal County's Elections Administrator, including 63,000 mail-in ballots delivered to the wrong voters and multiple Republican-heavy precinct locations running out of ballots," they said. "This is a comprehensive failure that disenfranchises Arizonans and exemplifies why Republican-led efforts for transparency at the ballot box are so important. Pinal County Elections Director David Frisk should resign immediately."