Thanks! A lot of text in that error. Have you tried invoking the iframe and asserting on one of the elements within You can user the cypress-iframe plugin to work from within it https://www.npmjs.com/package/cypress-iframe And a blog from cypress showing how to use it: https://www.cypress.io/blog/2020/02/12/working-with-iframes-in-cypress/ If you can narrow your selection down in the DOM, you should have an easier time with figuring out what's going wrong