# We can't update voice agent with custom voice id params

**URL:** <https://community.retellai.com/t/we-cant-update-voice-agent-with-custom-voice-id-params/2410>\
**Category:** Support Help\
**Tags:** bug\
**Created:** [April 21, 2026, 1:51pm UTC](https://community.retellai.com/t/we-cant-update-voice-agent-with-custom-voice-id-params/2410 "2026-04-21T13:51:16Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![myikit](https://yyz2.discourse-cdn.com/flex008/user_avatar/community.retellai.com/myikit/32/229_2.png) [@myikit](https://community.retellai.com/u/myikit)\
**Post date:** [April 21, 2026, 1:51pm UTC](https://community.retellai.com/t/we-cant-update-voice-agent-with-custom-voice-id-params/2410/1 "2026-04-21T13:51:16Z")

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When I create a new custom voice and after update voice agent I’m encountering like this error.  
Why I can’t update with new custom voice? am I made a mistake?  
Note: If I 'm using old custom voice, I can update it.

 ![Ekran Resmi 2026-04-21 16.45.51](https://canada1.discourse-cdn.com/flex008/uploads/retell1/original/2X/c/c6fa6798f0e5d700829061ad23c042e16a6623d7.png)

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**Author:** ![mark1](https://yyz2.discourse-cdn.com/flex008/user_avatar/community.retellai.com/mark1/32/2524_2.png) [@mark1](https://community.retellai.com/u/mark1)\
**Post date:** [April 21, 2026, 1:54pm UTC](https://community.retellai.com/t/we-cant-update-voice-agent-with-custom-voice-id-params/2410/2 "2026-04-21T13:54:24Z")

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Hey @myikit

Could you please share your Agent ID?

Thank You

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<div class="post-metadata">

**Author:** ![myikit](https://yyz2.discourse-cdn.com/flex008/user_avatar/community.retellai.com/myikit/32/229_2.png) [@myikit](https://community.retellai.com/u/myikit)\
**Post date:** [April 21, 2026, 1:59pm UTC](https://community.retellai.com/t/we-cant-update-voice-agent-with-custom-voice-id-params/2410/3 "2026-04-21T13:59:56Z")

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I’m sharing the Curl example directly with you;

curl --silent --location --request PATCH ‘[https://api.retellai.com/update-agent/agent\_0591e273a1b6f4cb5ecf34a752](https://api.retellai.com/update-agent/agent_0591e273a1b6f4cb5ecf34a752)’  
–header ‘Authorization: Bearer xxxxxxxxxx’  
–header ‘Content-Type: application/json’  
–data ‘{ “voice\_id”: “custom\_voice\_e55ddff2bf1941bfef56000eaa” }’

Thank you @mark1

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<div class="post-metadata">

**Author:** ![mark1](https://yyz2.discourse-cdn.com/flex008/user_avatar/community.retellai.com/mark1/32/2524_2.png) [@mark1](https://community.retellai.com/u/mark1)\
**Post date:** [April 21, 2026, 2:01pm UTC](https://community.retellai.com/t/we-cant-update-voice-agent-with-custom-voice-id-params/2410/4 "2026-04-21T14:01:17Z")

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Hey @myikit

I’ve forwarded this to our team for further investigation.

We’ll get back to you as soon as we have an update.

Best regards

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<div class="post-metadata">

**Author:** ![myikit](https://yyz2.discourse-cdn.com/flex008/user_avatar/community.retellai.com/myikit/32/229_2.png) [@myikit](https://community.retellai.com/u/myikit)\
**Post date:** [April 21, 2026, 2:05pm UTC](https://community.retellai.com/t/we-cant-update-voice-agent-with-custom-voice-id-params/2410/5 "2026-04-21T14:05:02Z")

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> [@mark1](#):
>
> I’ve forwarded this to our team for further investigation.
> 
> We’ll get back to you as soon as we have an update.

Thanks for your help, buddy! I’m waiting to hear from you.  
Thanks again.

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<div class="post-metadata">

**Author:** ![mark1](https://yyz2.discourse-cdn.com/flex008/user_avatar/community.retellai.com/mark1/32/2524_2.png) [@mark1](https://community.retellai.com/u/mark1)\
**Post date:** [April 21, 2026, 2:42pm UTC](https://community.retellai.com/t/we-cant-update-voice-agent-with-custom-voice-id-params/2410/6 "2026-04-21T14:42:30Z")

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Hello @myikit

Please make sure that the custom voice is already available in your workspace. Also, ensure that the selected `voice_model` is compatible with the provided `voice_id`.

Thank You