Login and registration

Hi,
My problem is with the plugin Awesome media gallery(AMG), i have installed this plugin and all works, but when i logged in or registrate it create me only a wordpress user and not also a AMG usere.
Instead with this plugin it have to create a double user..the developer of the plugin said me to contact you, for him the problem is to change the token time, but i don’t know what numbers to choose for the token time

https://wordpress.org/plugins/oauth2-provider/