If I do this.

mutation updateReport($reportId: ID!, $logs: [ID!]){
    updateReport(
      id: $reportId
      logsIds: $logs
      userId: $userId
    ), {
      id
    	logs{
        id
        startedAtOdometerReading
      }
    }
  }

I think you might need to add

$userId: ID!

to the first part of the mutation