Hello,
I'm trying to create a template flow for batch updating a SharePoint list with external data. I've successfully built 90% of the flow to attach SP IDs to the external data, formatting it for SP, and creating the lines necessary for each PATCH listed in the batch request. However, when I run the flow, it fails on the HTTP request with the following error:
{
"status": 404,
"message": "Cannot find resource for the request $batch.\r\nclientRequestId: 3f8252ae-470a-4e36-b10c-825b1822fb41\r\nserviceRequestId: f86705a0-50f1-c000-7efa-a0a88c2cfc84",
"errors": [
"-1",
"Microsoft.SharePoint.Client.ResourceNotFoundException"
]
}
HTTP Request in the editor:

Does anyone know more about what this error refers to or what I can try to fix it?
I've successfully used this batch set-up for batch create & batch delete operations before. I don't know why it won't work with batch update.
Thank You,