Just adding what I found when I was having the same issue as this seems to have been asked a number of times and I didn't see an appropriate answer. In the instructions for the Dataverse into the Azure SQL at https://learn.microsoft.com/en-us/power-apps/maker/data-platform/azure-synapse-link-pipelines?tabs=synapse-analytics there are the prerequisites - one of which is to enable the incremental folder update - refer to https://learn.microsoft.com/en-us/power-apps/maker/data-platform/azure-synapse-incremental-update. When you set up the link and add table you must enable the incremental.
The directory structure in your storage account is completely different with the model.json file at the root instead of being held in a folder where the /model.json parameter will work when you create the trigger.