Webhook response mapping : Program member field not found

[MathieuBellon]

Hi!
I am trying to register people from Marketo to our webinar platform thanks to webhooks.

I have created a custom Program Member field (Livestorm_unique_access_link)
When I map the webhook response I can see this field listed (screenshot below)
But everytime I test it I got this Unexpected error (field not found). 
When I map the response to a custom Lead field it works perfectly.

If the field is not accessible for mapping why is it listed?

I am missing something surely but can't see what.

Thanks for any idea on this one ! 

[SanfordWhiteman · Accepted solution]

Last I checked you can't update PMCFs from webhooks. It's a UI bug that makes it seem possible.

[MathieuBellon]

Hi!
Ok, that was indeed my theory. Documentation says it is not possible but the UI "says" it is possible.

I hoped that the documentation was wrong on this one.

Thanks for your feedback!