Can I cook with Ooni Pizza Steel 13 in my Ooni oven?

No, the Ooni Pizza Steel is only intended for use in domestic ovens, not Ooni ovens. This is for both safety and performance reasons. 

Steel conducts more heat than stone, so using a steel in your Ooni oven may result in a burnt base as well as other issues. Ultimately, our stones perform better in Ooni ovens, whereas our steels performs better in domestic ovens.