Doesn't work properly on iPhone (URL: 'https://cataas.com' does not match any of the prefixes whitelisted for use in the add-on.)

[gitcnd]

In the gmail app on iPhone, when reading an email, clicking the cat-paw icon produces the following error:-

URL: 'https://cataas.com/' does not match any of the prefixes whitelisted for use in the add-on.

It works OK in Chrome on a PC though, suggesting this is a problem with the core iPhone runtime, rather than the script/manifest?

I tried adding this, which didn't fix or change anything:-

  "urlFetchWhitelist": [
    "https://cataas.com/",
    "https://cataas.com/cat",
    "https://cataas.com/cat/says"
  ],