Please note that the address for support is the official forum below:
https://www.patreondevelopers.com/c/patreon-wordpress-plugin-support/11
For that case you have, its likely that the post is not uploaded to/saved as an attachmet in WP in Media library. PW requires the image to be locked to be present in media library and needs it to have an attachment id.
From checking page code, no attachment info seems to be added to the inserted image on the page and it may not be present in media library.
You can try uploading it to media library, ensuring that it is there, and then inserting it via WP toolbar or other means into the post, and then locking it.
Thanks for that. Apparently my Patrons are also unable to access the exclusive pages – the following is present in the comments:
ERROR for site owner: Invalid key type
Any idea what the problem is there?
Invalid key type message doesnt seem to be coming from the plugin or Patreon. Neither that ‘Error for site owner’ seems to be.
It may be some other plugin, or something from your host. You should check and confirm that it is relevant to this plugin or Patreon.