The message displayed is a warning, it is not an error. We might consider displaying an information message, rather than a warning, if this is disturbing.
If you are interested in using JWT authentication, you can set the environment variable PASSBOLT_PLUGINS_JWT_AUTHENTICATION_ENABLED to true. Let us know if you do not know how to do that.
If you are not interested in using JWT authentication, you can ignore this message.
The “passbolt way” to enabled plugins is to either play with the passbolt.php if you are not using a container.
In order to do so, here is an example of how to enable JWT authentication and mobile transfer (iOS beta version will be out this week)