Gradle signing plugin issue - unsigned jar and .asc file created

Question

I've generated my PGP private/public key pair and configured ~/.gradle/gradle.properties with the key information. Added the Gradle signing plugin to my build.gradle

plugins {
...
    id 'signing'
}

signing {
    sign jar
}

signJar task results in an unsigned jar along with an .asc file. Gradle version is 7.5.1.

Any ideas? or working example?