Why is my Youtube video showing unavailable on Gatsby Cloud?

The defaultX-Frame-Optionsheader value for the Gatsby Cloud Plugin isDENY. 

You'll need to setmergeSecurityHeadersto false in the gatsby-plugin-gatsby-cloud plugin options in your gatsby-config.js for your embedded video to render.   

plugins:[{
    resolve:`gatsby-plugin-gatsby-cloud`,
    options:{
      mergeSecurityHeaders:false,
},
},
]