“Failed to load resource” issue

Hello,
I am using the plugin “Power BI Embedded for WordPress”

As mentioned in the documentation, I have registered an app with Azure AD and it now appears in WordPress in the PowerBI Settings page. (I can see the “Oauth Status=Connected”)

I have followed the “app owns data” process (so I don’t need “Client secret”)
Then I add a new Power BI item in WordPress with all requested Information:
Embed type=Report
Report Mode=View Mode
Report Id=xxxxx (found in the url)
Group Id= xxxxxxxx (found in the url)
Dataset Id: not mandatory because I don’t need “Create mode”
Page Name: not requested for report publishing

The problem is that when I preview this embed item, I get an empty screen.
Same thing when I add a new page in WordPress and insert the shortcode in this page

When I inspect the page, I find in the console the following:
Failed to load resource: the server responded with a status of 404 (Not Found)
/wp-json/powerbi/v1/getToken:1

Do you have any ideay that could help
(I’m a beginner in wordpress)