I am very new to Cypress and not sure what I am doing wrong here. Here is html code for the website see below

and here is the code I am trying in cypress

cy.get('iframe[sandbox="allow-same-origin allow-scripts allow-popups allow-forms allow-modals"]')
      .its('0.contentDocument.body').then(cy.wrap).find('#helpForm').should('be.visible')

but it is failing and saying cannot find the element but if I try

cy.get('iframe[sandbox="allow-same-origin allow-scripts allow-popups allow-forms allow-modals"]')
      .its('0.contentDocument.body').should('be.visible')

it's work totally fine. even I tried

cy.get('iframe[sandbox="allow-same-origin allow-scripts allow-popups allow-forms allow-modals"]')
      .its('0.contentDocument.body').then(cy.wrap).find('div').should('be.visible')

but still no luck. I have no idea what I am doing wrong.