Hello,
I am a total beginner in ms flow. My task is to integrate signing application with Sharepoint. I created HTTP triggered flow that receives signed documents and then stores them in Sharepoint.

When I trigger this flow from Postman by executing generated url address then everything works just fine - document is added to Sharepoint. When I execute this url from my application then I receive:
org.springframework.web.client.HttpClientErrorException$Unauthorized: 401 Unauthorized: [{"error":{"code":"AuthorizationFailed","message":"You do not have permissions to perform action 'run' on scope '/triggers/manual/paths/'. Verify you are making the request with the appropriate HTTP method. See http://aka.ms/logic-trigger for details."}}]
I searched the internet and found some similar cases but in none of them, I found relevant explanations or solutions. If you could help me understand:
1. why is it working in postman and not in the application
2. how to fix it?