Firstly, apologies for the terrible title, and also if this is not the correct space for this.
I have a classic chatbot that terminates in email topics. I cloned and converted this topic, and for the most part it worked well. In one topic I used a Power Automate flow to add images to my chatbot, and these transferred over fine (I've since moved these images out the flow and into PVA!).
However, my three email topics are displaying errors preventing me from publishing the new chatbot, and the error messages are a bit unclear:

And this is one of the affected Actions:

This includes some values from within the topic and two global variables from preceding topics. The Power Automate flow these values link to is in use by my original chatbot still and is definitely working.
Am I missing any very obvious steps to identify, fix or bypass these errors? Is there a reason my images flow worked but the email one does not?
Thank you in advance for any suggestions you may have.