Propagate Managed Challenge Data across subdomains

So my website can be accessed from domain.com. My API is on api.domain.com.
I use Managed Challenges for security purposes. However, using a Managed Challenge on api will block off users due to the user not knowing about the subdomain and not being able to complete the managed challenge there, since the main entry point of the website is on domain, not api.
Is it possible to only show a managed challenge on the api if the request is coming from domain.com? Maybe propagate the challenge cookies through the API request? Is that possible?

Sorry, my question is:
Is it possible to only show a managed challenge on the api if the request is NOT coming from domain.com? Maybe propagate the challenge cookies through the API request? Is that possible?

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