iFrame Preview not displayed


I want to share my dashboard in our organisation App. After clicking on "Integrate this dashboard in an app", the iFrame preview is not displayed. (see below)

I am using:
Metabase 0.41.0
Firefox (Mac) 92.0.1 (64 bits)

Hi @TheoL
Check your browser developer console. I'm quite sure that your Admin > Settings > General > Site URL does not match how you're accessing Metabase.