Hi ​@Petar sorry to hear you're experiencing issues. 
Best thing is to contact support for this to see what's happening but from my experience it's best to check if you're not blocking popups or have an adblocker that might be causing this.
Try a different browser to see if that solves it.

Best,

Omar Lovert // Polaris Growth // Klaviyo Master Platinum Partner

We help with e-commerce growth through CRO, Klaviyo and CVO

Let's connect on linkedin

​@Petar I used to experience the same issue a while ago. Sent tons of messages to the Support but got zero response, had to troubleshoot and debug with a couple other things before I could get it solve.

I believe I should be able to help you with this though, check your DM.

Hi ​@Petar,

Did you ever figure out this issue? Let us know if you’re still experiencing this!

-Byrne

I haven't solved this problem with woocommerce integration.

​@Petar,

Got it, thanks for the reply! As Omar said above, we’d first recommend trying to integrate using an incognito window or a different browser altogether. If that doesn’t work, try completely removing the integration, and then disabling any adblockers on your browser, along with all WooCommerce plugins/extensions. I’ve seen cases where WooCommerce extensions interfere with Klaviyo’s ability to connect, so if you have any active, it’ll be important to disable them, at least while you’re briefly setting up the integration. Finally, if you manage to get to the next page, make sure that the correct WooCommerce store is connecting to the correct Klaviyo account. The page will look like this - pay attention to the names of the accounts:

 Hope this helps!

-Byrne