Node.js Sequelize对象“not associated”

I'm trying to write a belongsToMany association model in Sequelize in Node.js. I'm trying to associate a receiver device with the recordings that it will be playing. One recording will be played on many receiver devices. I created a through table where the association is stored with the one where (scope) clause of making sure the type of association is for "audio" since there will be other tables using this association as well.I'm trying to write a belongsToMany association