# \[BUG\] 8.1.0 Vision reports unknown expression function "isAuthorized"?

**URL:** <https://forum.inductiveautomation.com/t/bug-8-1-0-vision-reports-unknown-expression-function-isauthorized/43561>\
**Category:** Ignition\
**Tags:** vision, ignition80\
**Created:** [February 18, 2021, 12:49pm UTC](https://forum.inductiveautomation.com/t/bug-8-1-0-vision-reports-unknown-expression-function-isauthorized/43561 "2021-02-18T12:49:20Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\
**Post date:** [February 18, 2021, 12:49pm UTC](https://forum.inductiveautomation.com/t/bug-8-1-0-vision-reports-unknown-expression-function-isauthorized/43561/1 "2021-02-18T12:49:20Z")

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I’m getting this error when trying to use the Expression function [isAuthorized](https://docs.inductiveautomation.com/display/DOC80/isAuthorized):

```auto
ERROR com.inductiveautomation.ignition.client.util.gui.ErrorUtil - Unknown function: 'isAuthorized'

```

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<div class="post-metadata">

**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [February 18, 2021, 1:05pm UTC](https://forum.inductiveautomation.com/t/bug-8-1-0-vision-reports-unknown-expression-function-isauthorized/43561/2 "2021-02-18T13:05:11Z")

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Seems like the documentation is lacking, but this is a gateway-scoped function provided by Perspective.

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<div class="post-metadata">

**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\
**Post date:** [February 18, 2021, 1:06pm UTC](https://forum.inductiveautomation.com/t/bug-8-1-0-vision-reports-unknown-expression-function-isauthorized/43561/3 "2021-02-18T13:06:03Z")

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Is there any way to check security zone in Vision?

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<div class="post-metadata">

**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [February 18, 2021, 1:12pm UTC](https://forum.inductiveautomation.com/t/bug-8-1-0-vision-reports-unknown-expression-function-isauthorized/43561/4 "2021-02-18T13:12:49Z")

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I don’t know if there is an equivalent… maybe someone else will. `isAuthorized` is about security levels, though, not zones.

In Vision I think zones are automatically applied/checked when an operation that respects zones is performed.

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<div class="post-metadata">

**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\
**Post date:** [February 18, 2021, 1:23pm UTC](https://forum.inductiveautomation.com/t/bug-8-1-0-vision-reports-unknown-expression-function-isauthorized/43561/5 "2021-02-18T13:23:05Z")

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SecurityZones are incorporated into Security Levels though as well I think. At least that’s what it looks like in the Security Levels gateway page. I haven’t ever been able to actually use Security Zones yet though… in Vision or Perspective (I’m not getting a SecurityZone assigned to me when not logged in in Perspective)