Create signature in c# returns "invalid signature"

[amc (Aldo)]

Description
I am using framework .NET 5.0 to host a meeting in Zoom.
WebSDK is used.
Zoom pro account is used
Jwt already created and used

There’s an error “invalid signature” when it is created using C# example. I have tried create the meeting manually in Zoom Account, then join the meeting and the error happen again.

Error
Invalid signature when C# example
When I use ZoomMtg.generateSignature in client works fine.

Which version?
1.8.6

**Device

• Browser: Chrome

I have followed these links without luck:

Invalid Signature C#

Hi Tommy, Thanks for the reply, I’ve put my code into a github project. It is a .net core 3.0 server so you must have that installed first. (https://dotnet.microsoft.com/download/dotnet-core/3.0) First clone the app: git clone https://github.com/DanielPepka/NetCoreZoomUs Then modify the zoom controller file to have an api key / secret as well as an email address that is associated with that account. (“TODO - SET THIS”) From there you can either launch the app with visual studio or thro…

Invalid signature after changing app key

Hey @lance, For us to debug this further, can you please share the account # or email of the Zoom account who owns the JWT Token? Please send it to developersupport@zoom.us with a link to this thread. Thanks, Tommy

Any help will be great

Thanks

[tommy (Tommy Gaessler)]

Hey @amc ,

Can you please provide your Web SDK signature for a test meeting to developersupport@zoom.us so I can help you debug it?

Thanks,
Tommy

[amc (Aldo)]

Hello @tommy the signature is:

These are the error messages:

Thanks!

[amc (Aldo)]

Any idea, seems the signature added here is gone. I share another one:

Still having problems to host or join a meeting. This signature is to create one as a host.

Thanks!!

[tommy (Tommy Gaessler)]

Hey @amc ,

Your signature looks correct. Let me ask you this, are you trying to start a meeting you own, or a meeting that is owned outside of your account?

More info here:

Start a meeting on behalf of a user - Web SDK with OAuth

Hey @mayank.patel, We discourage asking customers to share their JWT Credentials with developers. I do see the headache here how you can’t use OAuth to start meetings for a user via the Web SDK since the Web SDK can only start meetings owned by the same account as the JWT App. I will share this feedback with our team and see if we can expand the Web SDK authentication to allow authorized users to start their own meetings. (CS-2206) In the meantime, I suggest having the host of the meeting s…

Thanks,
Tommy

[amc (Aldo)]

Hi @tommy I have tried start (host) then join a meeting using my API Key and API Secret.

Also I have tried join a meeting created manually using zoom portal

Using a schedule meeting:

Using Host a meeting directly in the menu:

Both without success yet.

Please your comments

Thanks!

[tommy (Tommy Gaessler)]

Hey @amc ,

I am going to send you a private message so we can assist further.

Thanks,
Tommy

[tommy (Tommy Gaessler)]

For others reference, I am sharing the solution here per @amc :

I just saw in the documentation that these couple of lines were added:

string msgHashPreHmac = System.Convert.ToBase64String (messageBytesTest);
byte[] messageBytes = encoding.GetBytes (msgHashPreHmac);

So I added and tested, now I am able to host and join meetings !

Thanks,
Tommy