IFS Cloud remote deployment, external url redirecting to internal url

Hi All,

we have a remote deployment environment in an azure tenancy (25R2SU11).  We have the public URL exposed via Azure application gateway/WAF which then routes to the internal URL.

When I hit the external URL i get redirected to the internal URL.  I have defined both systemUrl for internal and secondarySystemUrl for external fqdns in the main_config.json, redeployed the MT and still no luck.

Have also tried disabling and enabling the hostname override in the Azure AppGW.

Any ideas on what maybe missing.

Thanks
James