Api error access denied

Ok, the above shows that your localhost is working. So, again, do you get proper result from the mentioned function? 🤔 Take in mind that the example code (part that you haven't shown) doesn't return back to the browser anything if you haven't changed it somehow! 🙂

I have used the same code in github:

dropbox-sdk-dotnet/Program.cs at master · dropbox/dropbox-sdk-dotnet (github.com)

I only changed my Appkey.

and I add the (LoopbackHost="http://127.0.0.1:52475/") URI in the app console to correspond with the one at the code.

I want to be able to use API in a windows application in the future for multiple users (am using a Business License)

I believe the code must stay as is with the localhost URL, but what all other configurations I need to do in the console:

(* will localhost will be used at the final stage when it is ready for publishing or will I need to change it?

and the app console:

my concern what the following fields should be on the final shape:

1. Redirect URIs
2. Chooser / Saver / Embedder domains
3. Webhooks
4. Extension

but I keep getting the following exceptional error:

System.AggregateException
HResult=0x80131500
Message=One or more errors occurred.
Source=SimpleTest
StackTrace:
at SimpleTest.Program.Main(String[] args) in C:\Users\admsh\OneDrive\Desktop\dropbox-sdk-dotnet-master\dropbox-sdk-dotnet-master\dropbox-sdk-dotnet\Examples\SimpleTest\Program.cs:line 56

This exception was originally thrown at this call stack:
[External Code]

Inner Exception 1:
HttpRequestException: An error occurred while sending the request.

Inner Exception 2:
WebException: The request was aborted: Could not create SSL/TLS secure channel.

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admsho wrote:

...

(* will localhost will be used at the final stage when it is ready for publishing or will I need to change it?

...

---

Whatever is the public domain name of particular machine (if any), localhost domain (and the corresponding IP) is always available and the same. That's why it's convenient is such cases and you wouldn't need to change anything.

---

admsho wrote:

...

my concern what the following fields should be on the final shape:

1. Redirect URIs
2. Chooser / Saver / Embedder domains
3. Webhooks
4. Extension

...

---

For local applications only 1) matters; all others are ignored.

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admsho wrote:

...
WebException: The request was aborted: Could not create SSL/TLS secure channel.

---

Dropbox servers related to API interfaces support TLSv1.2 only! Check in your environment is the same connection encryption enabled or not. Make sure it is!

where should I check the TSL and fix it ?

For Windows you can start here: https://learn.microsoft.com/en-us/mem/configmgr/core/plan-design/security/enable-tls-1-2

Take in mind that your build environment may need additional "tuning"; read the related documentation.

Good luck.