The LinkedIn instructions for SNAP say to put in the URL of the plugin page: Example:
https://website.com/wp-admin/options-general.php?page=NextScripts_SNAP.php
LinkedIn’s documentation notes that it specifically rejects “?” as part of the URL:
“Please note that:
We strongly recommend using HTTPS whenever possible
URLs must be absolute (e.g. “https://example.com/auth/callback”, not “/auth/callback”)
URL arguments are ignored (i.e. https://example.com/?id=1 is the same as https://example.com/)
URLs cannot include #’s (i.e. “https://example.com/auth/callback#linkedin” is invalid)”
Consequently, the authorization in the setup is rejected to a 404 error code.
????
Thanks…Scot