Have been pointed at this thread by HubSpot support. I am wanting to send an automated email to contacts referencing property values from associated objects - just like you would do for a company or deal etc. But the values are in associated custom objects and the email personalization fails.
The current situation and limitations for custom objects use here look to be absurd - you are able to creat the personalization tokens you want in emails (for example) but you cannot preview their functionality (or non-functionality as it turns out) via test emails or previews? You can reference some types of associated objects, but not others? I’m normally a evangelist for the suberb integration of cusom object use across the various HubSpot tools, but this pointless limitation has shaken my faith.
Please fix this blind spot HubSpot team - and make available the full potential of the association & personalization mechanisms for outbound emails etc.