Hello support, I tried to use a custom voice from 11labs, I generated a new api key with permissions 'Text to Speech, Voices, Voice Generation, History', and can't add it to Vapi - it returns error 401. I checked 11labs api key, it works from comandline, I can get list of my voices at 11labs and get TTS (mp3 record of provided text). But Vapi cant use it. How to use custom voice from 11labs? Please help! https://cdn.discordapp.com/attachments/1397854098585423892/1397854099143262208/Screenshot_2025-07-16_at_19.50.09.png?ex=68833c94&is=6881eb14&hm=5c57f61e9fa4fbc854a0de9641861d1f39e5bfe05ba0bb870eb65fba5f6da4e8& https://cdn.discordapp.com/attachments/1397854098585423892/1397854099784994976/Screenshot_2025-07-16_at_19.56.01.png?ex=68833c94&is=6881eb14&hm=1bf39d37bb98609e3ebf48fd691cbd7bb3cf04f64ccbdce5e816e6a784ec133c& https://cdn.discordapp.com/attachments/1397854098585423892/1397854100258947223/Screenshot_2025-07-16_at_20.11.09.png?ex=68833c94&is=6881eb14&hm=b97ec2bc541ef207e64b33729615b7ed502c3bb7bec3a59ee672ae70cc890441&

Make sure your API key with TTS and Voice permissions is added under Provider Keys in Vapi, your custom voice is in the Voice Lab not just Studio, and you're referencing the correct

voiceId

in your assistant config. 401 errors usually mean the key is invalid, missing, or the voice isn’t synced properly..

Hey I am currently experiencing this same issue, where adding my API key results in a 401 error. Could this be because my API key is from a European Residence ElevenLabs instance?

try using your key in this to test it. if it works here it should work in VAPI: https://elevenlabs.io/docs/api-reference/user/get?explorer=true

Thanks! This clears things up. My key works for https://api.eu.residency.elevenlabs.io/v1/user but not for https://api.elevenlabs.io/v1/user (returns invalid) That does lead to a new question: Can I get Vapi to call the eu.residency endpoint? Or should I find a way to get a global key?

We will DM you directly