Hi,
I was able to make this work using the following diagram and outputs. However, it will only grab the first tracking number. If tracking is updated with a new tracking number at any point, it will not update. I posted about it here, in case anyone has any answers.
Unable to Retrieve Last Object In Array (Last Tracking Number Used).
If my scenario of updating new tracking numbers for an order does not apply for you, then this diagram below should work for you:
Create Fulfillment Webhook
Choose your table, view, and then use this formula:
Map the record ID and map the tracking
Cheers!