ISSUU – EMbeds not working

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1. It is easy to include items from issuu.com just by entering the URL into the editor, https://wollmacht.de/issuu-in-texteditor/
2. I can enter the URL in a slide as well
3. I can create a slider whith 3 or more slides where I enter the URL of the issuu publications, background-sliders
4. I try to enter the shortcode [slide-anything id=”347″] into a Gutenberg-short-code-block, does not work, https://wollmacht.de/embed-mit-shortcode/
5. I use Elementor Shortcode-Widget and add the shortcode, the issuu-publications are not shown, https://wollmacht.de/embed-with-elementor/

what to do? I have no idea how to present ISSUU-publications in a slider