mutableListOf() I want to use it globally using lateinit Kotli

Question

private lateinit var participants: mutableListOf<ParticipantDTO>



participants = mutableListOf<ParticipantDTO>()



private fun searchMatchInfoByMatchID(matchId: String,summonerName: String){
    lolAPIForMatch.getMatchInfoByMatchID(matchId, API_KEY)
        .enqueue(object : Callback<MatchDTO>{
            override fun onResponse(call: Call<MatchDTO>, response: Response<MatchDTO>) {
                if(response.isSuccessful.not()){
                    return
                }

                response.body()?.let {

                   
                    it.info.participants.filter {
                        it.summonerName == "${summonerName}"
                    }.forEach {
                        
                        participants.add(it)
                    }
                    participantAdapter.participants = participants
                }
            }

            override fun onFailure(call: Call<MatchDTO>, t: Throwable) {

            }

        })
}


participantAdapter.participants = participants

First, declare it as a global variable.

After initialization in onCreate function.

By putting data into participants in the searchMatchInfoByMatchID function

I want to assign participants to participantAdapter.participants, but the data is not being allocated.