I am very new to Marketo. I am creating a holiday e-mail campaign and am trying to put in a Spotify code for a holiday playlist I made. When I put in the code, the playlist shows up in both the draft and preview mode. I simply have just been clicking the HTML button in the draft edit of a text box and putting it in there. When I send myself a sample e-mail, the playlist does not show up at all. Is there a way to fix this?
By "embed code" do you mean a Spotify player IFRAME? This will never work in a delivered email, period. It will however work in a preview window, since content restrictions enforced by email readers do not apply there.
Such differences are part of using a live web app to compose what are basically "deadened" HTML pages.