User details not being sent to Destination Intercom

[nihallocalo]

Describe the bug
When sending an Identify event from Backend(JavaScript) to Intercom as the destination via RudderStack, an error is returned stating "User Not Found." The event fails to process and does not reach Intercom.

Steps to reproduce the bug

Go to the RudderStack dashboard.
Select the source as Elixir
Set Intercom as the destination for the event.
Trigger an Identify event from the Elixir
Check the live event logs in RudderStack for the event delivery status.
Observe the error message.
Expected behavior
The Identify event should be successfully processed and delivered to Intercom, with the user being recognized and identified in the system.

Screenshots :

Desktop (please complete the following information):

OS: macOS Monterey 12.6
Browser: Chrome
Version: 117.0.5938.132

Smartphone (please complete the following information):
NA

Any additional context

The error may be caused by an incorrect or missing user identifier (e.g., userId or email) in the payload from GA4 to Intercom.
This issue could be related to the mapping of user attributes in RudderStack between GA4 and Intercom.
This issue can be because of the new pages with events firing before _identify

[contributor-support]

Thanks for opening this issue! We'll get back to you shortly. If it is a bug, please make sure to add steps to reproduce the issue.

[gitcommitshow]

@nihallocalo in the payload screenshot, it is not visible if userId is present or not. Can you please check and confirm?