A WordPress instance refers to a single installation of a WordPress site.
In terms of the plugin license, one instance refers to each individual website where the plugin is activated. In the case of a single site WordPress, each website will be counted as a single instance.
Note: The licenses for the WordPress SAML SSO plugin is instance-based. For more information, you can visit the following links:
Please drop an email at firstname.lastname@example.org if you have any further questions.