Error: Failed to create a subscriber in Klaviyo, the API key specific is invalid

  • 26 January 2023
  • 5 replies

I have set up my squarespace and klaviyo accounts using the API key, but for some reason I keep getting a trigger error and I have no idea why! Any tips? thanks!

5 replies

Userlevel 7
Badge +14

Hi @Alex197 

You should create a separate topic so it gets proper visibility as yours is a different issue.

I am having the same issue but mine is telling me this please help. Thank you. 

Failed to create a subscriber in Klaviyo

Required field "email" (email) is missing.

Troubleshoot error

Userlevel 7
Badge +14


Perhaps you switched them around.

Or perhaps there was a leading/trailing space.

I’d try reconnecting Klaviyo app again here:



I’ve already inputted the API keys but it’s still not working! Any ideas? thanks!

Userlevel 7
Badge +14

Hi @risecoffeebox 

Good question.

To locate your API Key in your Klaviyo account, please follow these steps:

  1. Log into Klaviyo account.
  2. Go to your account settings.
  3. Copy your Klaviyo Public API key / Side ID and Private API key to your clipboard.