# Web Embedded Meeting SDK errorCode: 3712 reason: "Signature is invalid."

**URL:** <https://devforum.zoom.us/t/web-embedded-meeting-sdk-errorcode-3712-reason-signature-is-invalid/67837>\
**Category:** Web\
**Tags:** web-meeting-sdk\
**Created:** [April 20, 2022, 2:28pm UTC](https://devforum.zoom.us/t/web-embedded-meeting-sdk-errorcode-3712-reason-signature-is-invalid/67837 "2022-04-20T14:28:00Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![fedorov.danil](https://avatars.discourse-cdn.com/v4/letter/f/22d042/32.png) [@fedorov.danil](https://devforum.zoom.us/u/fedorov.danil)\
**Post date:** [April 27, 2022, 1:51am UTC](https://devforum.zoom.us/t/web-embedded-meeting-sdk-errorcode-3712-reason-signature-is-invalid/67837/5 "2022-04-27T01:51:39Z")

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So, I’ve tried to create a signature with an example app that you’ve shared.  
As I can see the logic is the same I used to create my token. And it suggests using SDK keys instead of JWT keys. So, in case I use the JWT key (the same key I used to [create a meeting](https://marketplace.zoom.us/docs/api-reference/zoom-api/methods/#operation/meetingCreate) with an API request) it returns “Signature is invalid”. And, in case I use SDK keys it returns:  
errorCode: 200  
reason: “Fail to join the meeting.”

So both options aren’t working for me…

P.S. Here’s why I’ve used the JWT token and not an SDK token - [Zoom sample-web-app "Signature is invalid" 3712 error code - #3 by wizard\_files3](https://devforum.zoom.us/t/zoom-sample-web-app-signature-is-invalid-3712-error-code/40089/3)

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