# iOS SDK JWT key not working

**URL:** <https://devforum.zoom.us/t/ios-sdk-jwt-key-not-working/7996>\
**Category:** iOS\
**Created:** [February 11, 2020, 12:16pm UTC](https://devforum.zoom.us/t/ios-sdk-jwt-key-not-working/7996 "2020-02-11T12:16:05Z")\
**Posts on this page:** 1\
**Showing post:** 7

<div class="post-metadata">

**Author:** ![carson.zoom](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/carson.zoom/32/785_2.png) [@carson.zoom](https://devforum.zoom.us/u/carson.zoom)\
**Post date:** [February 27, 2020, 3:28am UTC](https://devforum.zoom.us/t/ios-sdk-jwt-key-not-working/7996/7 "2020-02-27T03:28:20Z")

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Hi [osemenyshyn](https://devforum.zoom.us/t/ios-sdk-jwt-key-not-working/7996/6),

Thanks for the reply. The exp should be the timestamp when the JWT token expires. And the unit for tokenExp is sec, and the minimum value should be issueTimestamp + 1800 (30 mins, no max), here is an example:

```auto
{
  	"appKey": "string", // Your SDK key
"iat": 1582774049,
"exp": 1582848000
"tokenExp": 1582776049 (1582774049 + 2000)
}

```

Hope this helps. Thanks!

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