Site Kit , 404, Setup, Analytics

Hi,

I’m having trouble setting up Site Kit on my WordPress site.

We’ve just launched a brand new version of our website on the same domain. Prior to launching the new site, Site Kit & Analytics were both working fine. The domain is https://www.bigcloud.io

When I now attempt to setup Site Kit, I experience the following problem when using this path;

1. WordPress > Google Site Kit Plugin Dashboard > Start Setup
2. Sign In With Google
3. Allow
4. 404 Not Found – nginx/1.14.2

Does anybody know what I need to do in order to get this working? I can’t find a solution online. Thank you in advance.