Hi J Rollins ,
Welcome to Microsoft Q&A platform and thanks for posting your question here.
It seems that you are getting 403 forbidden error while running an ADF pipeline. Could you please provide more details of what the pipeline is actually doing? It says "Error While Downloading Script"- do you know which script it is referring to in your pipeline?
This might have occurred in case your IR is in same region as your blob storage/adls account and it is not allowing all networks to have the access permission.
You could try to create the IR in different region than your blob storage and make sure to whitelist the IPs of that region.
For more details, kindly watchout this video: The remote server returned an error 403 Forbidden SAS URI Azure Blob Storage Azure Data Factory
More information here:
Discover service tags by using downloadable JSON files
Download Azure IP range for different regions of Azure public cloud
Hope it helps. Please let us know how it goes. Thankyou