I could not see any error in the screenshot or in the live page.
Since shortcoder does not modify the shortcode content, it could be that there is some issue with the code itself? You can test/confirm this by pasting the code directly inside the post without using the shortcode.
I entered the code on other websites like our blog (through Hubspot, not WordPress directly) and it seems to work fine. However, I did enter the code directly onto the WordPress page and it did not work.
Does your shortcoder work with iframe code? Because that is what I’ve been given.
The image you shared is not linked correctly. Anyways, there is no limitation w.r.t Shortcode content. What you set as shortcode content will be inserted into the page.
If the code you have works when it is inserted directly onto the page, then it will work when you insert it via shortcoder.
Shortcoder creates short reusable tags for large code snippets.
I would suggest paste the code directly onto to the page and share that error with the code provider. They should help you understand if something is missing in the code or some configuration is wrong.