# useClassicEngine=true with an OIE tenant

**URL:** <https://devforum.okta.com/t/useclassicengine-true-with-an-oie-tenant/28540>\
**Category:** OAuth/OIDC\
**Tags:** widget\
**Created:** [May 30, 2024, 2:51pm UTC](https://devforum.okta.com/t/useclassicengine-true-with-an-oie-tenant/28540 "2024-05-30T14:51:15Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![gualtiero](https://sea1.discourse-cdn.com/oktadev/user_avatar/devforum.okta.com/gualtiero/32/4635_2.png) [@gualtiero](https://devforum.okta.com/u/gualtiero)\
**Post date:** [May 30, 2024, 2:51pm UTC](https://devforum.okta.com/t/useclassicengine-true-with-an-oie-tenant/28540/1 "2024-05-30T14:51:15Z")

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Hi,  
I’m using SIgn-in widget 7.18.0 on a SPA application with a Classic Engine tenant; the flag `useClassicEngine` is true and everything is working fine.

When will we migrate the tenant to OIE, should we immediately set this flag to false or can we keep it as true until the following application update?

Thanks,

Gualtiero

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**Author:** ![andrew1](https://avatars.discourse-cdn.com/v4/letter/a/9de053/32.png) [@andrew1](https://devforum.okta.com/u/andrew1)\
**Post date:** [June 18, 2024, 12:56pm UTC](https://devforum.okta.com/t/useclassicengine-true-with-an-oie-tenant/28540/2 "2024-06-18T12:56:42Z")

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Hi,

Here you can find our OIE upgrade guide with the recommended aspects that you would need to change in order to get your tenant up and going for on OIE: [Identity Engine upgrade overview | Okta Developer](https://developer.okta.com/docs/guides/oie-upgrade-overview/main/)

After upgrading to the OIE tenant, you would need to remove the useClassicEngine is true snippet.

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<div class="post-metadata">

**Author:** ![gualtiero](https://sea1.discourse-cdn.com/oktadev/user_avatar/devforum.okta.com/gualtiero/32/4635_2.png) [@gualtiero](https://devforum.okta.com/u/gualtiero)\
**Post date:** [June 18, 2024, 1:22pm UTC](https://devforum.okta.com/t/useclassicengine-true-with-an-oie-tenant/28540/3 "2024-06-18T13:22:02Z")

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Thanks @andrew1 . I was wondering if I should remove the flag **immediately** after the migration to OIE or if I have at least a few hours to remove it.

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**Author:** ![system](https://global.discourse-cdn.com/oktadev/original/1X/589c4c5f80de422d01f47cee7185a7fb8227835c.png) [@system](https://devforum.okta.com/u/system)\
**Post date:** [July 18, 2024, 1:23pm UTC](https://devforum.okta.com/t/useclassicengine-true-with-an-oie-tenant/28540/4 "2024-07-18T13:23:01Z")

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