Webmaster tools showing 200 page load ok - all other testing tools show a 301

[RobertN-London]

hey, on https://www.xxx.co we've setup a 301 redirect to xxx.us - > BUT in webmaster tools its still showing a 200 load ok, whereas on all other testing tools its showing a 301 redirect (screamingfrog etc)

even https://dns.google.com/query?name=www.xxx.co is showing that its 301 redirected.

Any ideas? as we want to trigger the change of address tool in WMT and its saying it cant as it loads the homepage still....

[RobertN-London]

and when we trigger it in the serps by search xxx.co - it completely ignores the 301 redirect and loads the error page. Any ideas? is this a google caching issue?

[RobertN-London]

So tech team found that redirecting via your dns vs your CDN is different - whilst SEO tools found that changes in domain name provider where ok - due to https its seen be google as man if the middle security hack!