What plugin is this exactly? When I search for it, I get a number of different results.
That said, the cause is probably the same. Our hosting blocks any access that does not originate from browsers. And Adobe Lightroom is not a browser. So that kind of integration probably doesn’t work on our hosting.
After reading the plugin’s documentation, I’ve found out that the Lightroom plugin uses external API calls (i.e.: Wordpress REST API) in order to verify the token from your Wordpress site. Unfortunately, it’s currently impossible on free hosting. Please consider upgrading to premium.
Make sure that the plugin and your website works normally. WP/LR Sync might not work properly if:
The WP REST API is disabled by a security plugin … **
*Infinityfree’s security system disables the WP REST API, too*