Did you find a solution to this issue? We are also looking to associate YouTube video with Marketo landing page with no luck
You should open a new thread (only the OP can mark answers correct, so it's better to open the discussion to the current community). Link back to this thread for reference if you need to.
Please include the details about what you've tried so far beyond just "no luck."
Hi Colby and Arye,
The trick here is to register your Marketo subdomain with Google Search Console--because you won't have the option of using an uploaded file or a meta tag, you'll need to add a TXT or CNAME record to your DNS records. Once that's done and your YouTube account is set as an owner of that property, you should be able to link in annotations to your Marketo subdomain.