Is it possible to edit a map in an iframe on another site than umap?

Hello everyone, Even though my map is set to allow anyone to edit, and I can actually edit it anonymously on umap.openstreetmap.fr, whenever I'm trying to edit it in an iframe on another website where it's embedded, I get this error: "action not allowed" (translated from french). I get the error only when saving changes.

And I have to say that the website where the map is embedded is accessed localy, but it does access the internet to display the map with no issue. So my website is actually only http://localhost

Is this error normal or should I be able to anonymously edit this map? Here it is: https://umap.openstreetmap.fr/fr/map/grenoble-libre-edition_58385

I hope someone could enlighten me...

Edit: Here is a picture of the error after creating a new marker and trying to save it in the iframe

Edit 2: Here are the iframe element parameters (I removed the first iframe tag because it wouldn't display the code correctly):

width="980px" height="550px" frameBorder="0" src="https://umap.openstreetmap.fr/fr/map/grenoble-libre-edition_58385?scaleControl=true&miniMap=true&scrollWheelZoom=true&zoomControl=true&allowEdit=true&moreControl=false&datalayersControl=false&onLoadPanel=undefined&captionBar=false&editInOSMControl=true">