@JDhere I will need some more details from you so have sent you a PM in order to troubleshoot

Hi @JDhere Was your issue resolved, and how? I am facing same error on 2.4.3 and it is no firewall issue as the requests reach the server. But the requests get a 302 to base_url and message 'invalid form key'.. any idea? Thanks

@Laeubinl I work for Klaviyo Support and not sure if your issue is the same as JDhere.  Have you been trying this from a local virtual environment?  If so unfortunately you cannot integrate with Klaviyo.  If not, I would like to suggest that you follow protocol to contact support as documented here as we will need to get further details from you.

The issue was I was using a private IP for testing, so the error came:

Klaviyo is unable to connect to Magento Server for OAuth Handshake.Url tried was: NonePlease ensure that both /oauth/token/request and /oauth/token/accessare accessible

So I changed to public IP, it worked!

Klaviyo is unable to connect to Magento Server for OAuth Handshake.Url tried was: NonePlease ensure that both /oauth/token/request and /oauth/token/accessare accessible

Hi can you tell me where i need to  be change the public ip in magento klaviyo extension

Klaviyo is unable to connect to Magento Server for OAuth Handshake.Url tried was: NonePlease ensure that both /oauth/token/request and /oauth/token/accessare accessible

@Sunil_1999  I am not sure I am following your inquiry.  Magento Integration will only work with a Magento instance on a public IP why would you need to change anything in the magento klaviyo extension if its installed on a magento with a public ip?