# Zoom Meeting SDK (Windows C# wrapper) — Authentication Error with SDKAuth

**URL:** <https://devforum.zoom.us/t/zoom-meeting-sdk-windows-c-wrapper-authentication-error-with-sdkauth/137491>\
**Category:** Windows\
**Created:** [September 19, 2025, 11:24am UTC](https://devforum.zoom.us/t/zoom-meeting-sdk-windows-c-wrapper-authentication-error-with-sdkauth/137491 "2025-09-19T11:24:56Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![ihimanshunayak](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/ihimanshunayak/32/71238_2.png) [@ihimanshunayak](https://devforum.zoom.us/u/ihimanshunayak)\
**Post date:** [September 19, 2025, 11:24am UTC](https://devforum.zoom.us/t/zoom-meeting-sdk-windows-c-wrapper-authentication-error-with-sdkauth/137491/1 "2025-09-19T11:24:56Z")

</div>

Hi,

I’m working with the **Zoom Meeting SDK (Windows C# wrapper)** in my WPF/.NET project.  
The SDK initializes successfully, but when I try to call `SDKAuth()` with my JWT token, I get the following error:

```csharp
Error: (ZOOM_SDK_DOTNET_WRAP.CZoomSDKeDotNetWrap.Instance
       .GetAuthServiceWrap().SDKAuth(param)) SDK internal error

```

Sometimes I also see:

```csharp
Error: Unauthentication (when calling MeetingService.Join)

```

I generated a JWT using my app credentials (Client ID & Secret) but the SDK does not seem to accept it.

Has anyone faced this issue before?

- Am I missing a specific setting in the Zoom Marketplace App setup?

- Or do I need to use a different set of credentials (SDK Key/Secret vs Client ID/Secret)?

Any guidance would be greatly appreciated.

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex016/uploads/zoomdeveloper/original/3X/6/1/614bdd549b610bbaa46ff934617683a02bdaa03c.png) [@system](https://devforum.zoom.us/u/system)\
**Post date:** [September 19, 2026, 11:25am UTC](https://devforum.zoom.us/t/zoom-meeting-sdk-windows-c-wrapper-authentication-error-with-sdkauth/137491/2 "2026-09-19T11:25:39Z")

</div>

Closed on September 19, 2026, 11:25am UTC

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