Vimeo embed OK on laptop and android, does not work on iOS

I embedded a video into a simple page from vimeo with the Add/Media/Video option.
Vimeo settings: Hide from Vimeo, embed: necessary domains enabled.
I added "referrerpolicy=“origin” into the iframe to make sure vimeo gets the data to allow display.

Site works from laptops and android phones, but I get a “sorry BEcause of its privacy settings, this video cannot be played here” message on Safari and also Chrome on iOS.

Any ideas?