Benchmark email marketing newsletter sign up form error on my WP site

I’ve placed a shortcode from benchmark email marketing to my site for a newsletter signup form. Sometimes the form shows up correctly on the page, and other times I get an error message saying “There was an error obtaining the Benchmark signup form”.

The times when I get the error message and then log into my site to see what’s wrong, it then automatically resolves itself and I see the form on the page correctly, but when I log back out of my site and go to the same page, the error message is back saying “There was an error obtaining the Benchmark signup form”.

I’ve tried creating new signup forms in benchmark but the same thing happens with the periodic error message. And I’ve tried clearing cache, creating new pages and arranging the blocks differently. I’ve tried pushing different forms to WordPress from benchmark and getting different shortcodes for signup forms but the same error always happens.

The page I need help with: [log in to see the link]