Hi ​@Youss 

Thank you for posting in the Community.

It appears that there could be a typo in your destination URL. 

 /apihttps:/a.klaviyo.com/api/lists/Wn7ttE/profiles/ should be https:/a.klaviyo.com/api/lists/Wn7ttE/profiles/

Can you try this and see if it solves the problem?

Yeah, like Anna said, if this is not a typo, it's the '/api’ in the '/apihttps:/a.klaviyo.com/api/lists/Wn7ttE/profiles/’

But if that's not the case and you use https://a.klaviyo.com/api/lists/Wn7ttE/profiles and you're still getting a 404, could it be that the list ID is not correct? 

Hello ​@tsalamazing and ​@annasophiefc,
Thanks you guys for you quick response. 
Actually I double checked everything. 
No typos, but now I have this error message instead
 

Just tested it on Postman and it tells me this: 

Cloud Agent Error: Couldn't resolve host. Make sure the domain is publicly accessible or select a different agent.

I think because you already have what it calls a "klaviyo connection”, the URL field should only take what comes the main api URL

For example: You want to call https://a.klaviyo.com/api/lists/Wn7ttE/profiles

Your Klaviyo connection already includes the "https://a.klaviyo.com/api”

So, you only have to add the "/lists/Wn7ttE/profiles” in your URL field

​@tsalamazing it is working !! Thanks a lot for your help 

Hello!

The issue seems to be related to the incorrect formatting of the API endpoint. Ensure the URL matches the one in the Klaviyo documentation without extra prefixes like https:/api. It should look like this:
https://a.klaviyo.com/api/lists/{list_id}/get_profiles

Also, while resolving your API issue, consider tools like mailtester.ninja for verifying and cleaning your email lists. It complements your API process by ensuring the extracted profiles are valid and free from risky addresses or typos.

Good luck, and feel free to share more details if the issue persists!