Heads up: this site won't play inside Vibras yet. It blocks being shown in other sites, so people only get a card that opens a new tab. Add this header to your site, then test again from My submissions. Why this happens
Embedding
Opens in its own tab
Your Content-Security-Policy says frame-ancestors 'none', so no other site may show it.
How to fix it
Your site sends
Content-Security-Policy: frame-ancestors 'none'Send this instead
Content-Security-Policy: frame-ancestors 'self' https://www.vibras.si https://vibras.si
Already send a Content-Security-Policy? Add the frame-ancestors directive to it rather than sending a second policy. More on this
Plays, but sign-in doesn't stick or a login page won't open? Make your site work in Vibras