Kotlin Moshi Adapter not called - kotlin

Question

I'm trying to write a Moshi adapter in Kotlin that will create enums based on an integer value, and will also default to a specific enum value if it encounters an unsupported value.
My adapter is never getting called, which causes the default enum adapter to fail with the included stacktrace.
Tracing the code show that the #ToJson annotation somehow isn't present, and so the adapter isn't added when it should be.
Declaring the adapter
enum class Status {
IDLE,
IN_PROGRESS,
FAILED,
SUCCESS,
UNKNOWN;
companion object {
private val map = Status.values().associateBy(Status::ordinal);
fun fromInt(type: Int?): Status {
var ret = map[type]
if (ret == null) {
ret = UNKNOWN
}
return ret
}
}
class Adapter {
#ToJson
fun toJson(status: Status): Int {
return status.ordinal
}
#FromJson
fun fromJson(value: Int): Status {
return fromInt(value)
}
}
}
Building Moshi
#Provides
#Singleton
fun provideMoshi(): Moshi {
return Moshi.Builder()
.add(Status.Adapter())
.add(KotlinJsonAdapterFactory())
.build()
}
Dependencies
implementation 'com.squareup.moshi:moshi:1.6.0'
implementation 'com.squareup.moshi:moshi-kotlin:1.6.0'
Stacktrace
05-29 18:57:56.603 24560-24560/com.example.app E/MyActivity: com.squareup.moshi.JsonDataException: Expected one of [IDLE, IN_PROGRESS, FAILED, SUCCESS, UNKNOWN] but was 2 at path $[0].status
at com.squareup.moshi.StandardJsonAdapters$EnumJsonAdapter.fromJson(StandardJsonAdapters.java:297)
at com.squareup.moshi.StandardJsonAdapters$EnumJsonAdapter.fromJson(StandardJsonAdapters.java:266)
at com.squareup.moshi.JsonAdapter$2.fromJson(JsonAdapter.java:137)
at com.squareup.moshi.ClassJsonAdapter$FieldBinding.read(ClassJsonAdapter.java:196)
at com.squareup.moshi.ClassJsonAdapter.fromJson(ClassJsonAdapter.java:158)
at com.squareup.moshi.JsonAdapter$2.fromJson(JsonAdapter.java:137)
at com.squareup.moshi.CollectionJsonAdapter.fromJson(CollectionJsonAdapter.java:76)
at com.squareup.moshi.CollectionJsonAdapter$2.fromJson(CollectionJsonAdapter.java:53)
at com.squareup.moshi.JsonAdapter$2.fromJson(JsonAdapter.java:137)
at retrofit2.converter.moshi.MoshiResponseBodyConverter.convert(MoshiResponseBodyConverter.java:45)
at retrofit2.converter.moshi.MoshiResponseBodyConverter.convert(MoshiResponseBodyConverter.java:27)
...