The plugin has been moved to new repository.
Please browse to grails-plugins fork for new updates for the plugin source code: https://github.com/grails-plugins/grails-spring-security-oauth2-provider
See documentation and the Grails plugin page for further information.
Until the newer deploys work with the Grails repos, you may use the following for Grails 3.3+:
repositories {
...
maven { url "http://dl.bintray.com/bluesliverx/grails-plugins" }
}
dependencies {
...
compile 'org.grails.plugins:spring-security-oauth2-provider:3.1.0-RC1'
}