Hi @Pilar,
Could you please share a screenshot of your flow's configuration?
Could you please show a bit more about your error message?
Further, do you want to fill the Title dynamic content within "Update event" action of EventBrite to update the existing event in EventBrite?
If you want to fill the Title dynamic content within "Update event" action of Eventbrite connector to update the existing event in EventBrite, I think you have a misunderstanding in "Update event" action of Eventbrite connector. The Event field of "Update event" action of Eventbrite connector is required to fill a event id which is used to identify the event uniquely.
Actually, the "Update event" action find the specific event via a unique event id, such as, the '43693501439' in Eventbrite. You could consider add a "Create event" action of Eventbrite within your flow and then run the flow. Wihtin the flow run history, view the output the "Create event" action returned:
You would get the event id within the output of "Create event" action. So if you want to update the existing event in Eventbrite, you must find the specific event and get the Event ID, then put the event id within Event field "Update event" action to update the existing event. But there is no action to get Eventbrite events within Eventbrite connector in Microsoft Flow currently, so I afraid that there is no way to achieve your needs in Microsoft Flow. If you would like this feature to be added in Microsoft Flow, please submit an idea to Flow Ideas Forum:
https://powerusers.microsoft.com/t5/Flow-Ideas/idb-p/FlowIdeas
Best regards,
Kris
