Installation and server related problems

I was able to download H5P content types for my first book in Pressbooks using my educational institutional account; however, when I started a second one, it didn't work. I'd activited H5P in Plugins, but when I tried "Add New", I got the message 'It looks like there are no content types installed. You can get the ones you want by using the small 'Download' button in the lower left corner on any example from the Examples and Downloads page and then you upload the file here."

I am using Wordpress to run H5P and am getting the attached message. Can someone help, please?

Hello, I am attempting to run H5P from wordpress and I am getting "Your site is having difficulties connecting to H5P.org and listing the available content types." Please see the attached