Working on Local but not on Live site?

Hi there, I am having an issue where I can get this plugin working perfectly on my localhost (MAMP) but when I replicate it on live I am getting “Whoops, the page or event you are looking for was not found.”

The environments are otherwise exactly the same, using the same codebase and database – I pulled a new live copy of the database down to my local. They are using two separately API apps within Eventbrite, so have different OAuth tokens. I have double and tripled checked the details on both and am completely stumped! Also my live installation is using 64 bit PHP… I think. Is this correct?

Here is my live installation: https://readeasy.org.uk/events/

Any advice very gratefully received! Thank you.