Webview isn’t working

Webview isn’t working without base path.
When give https://my-domain.com/ it working good but when i am give https://dashboard.my-domain.com/ it isn’t working showing blank page why????
Give me another webview extension.

Works OK for me with a sub-domain.

Try: https://ai2.metricrat.co.uk

This indicates you are already using an extension ? Which one ?