Scan isn’t working (Pantheon hosted site)

Hi! I’ve installed this plugin on a website hosted on Pantheon (https://pantheon.io/).

Pantheon provides 3 separate environments: “development”, “test”, and “live”.

I first installed the plugin in the development environment, used the scan and worked perfectly! The scan completed in a few seconds.

However, when I pushed the changes to “test” and went to try out the scanner, it never made any progress. I let the scan run for 10+ minutes and stayed in 0% the whole time. I used debug mode to see if I any logs got created but I never got one.

I tried the suggestion of giving WP more memory, I tried with 128MB but it did nothing to help.

Any advice for getting the scan working is more than welcome, thanks!