findOne include other models with more than one belongsTo

I am using nodejs with Sequelize & PostgreSQL. I have a User table which has 3 relationships with a UserMessagingSystem table:

UserMessagingSystem.belongsTo(User, {
  foreignKey: {
    name: 'salesperson',
  }
});
UserMessagingSystem.belongsTo(User, {
  foreignKey: {
    name: 'createdBy',
  }
});
UserMessagingSystem.belongsTo(User, {
 foreignKey: {
   name: 'updatedBy',
 }
});
User.hasMany(UserMessagingSystem, {
  foreignKey: {
    name: 'salesperson',
  }
});
User.hasMany(UserMessagingSystem, {
  foreignKey: {
    name: 'createdBy',
  }
});
User.hasMany(UserMessagingSystem, {
  foreignKey: {
    name: 'updatedBy',
   }
});

When I do a findOne:

User.findOne({ 
  where: {id: 33},
  include: [ { model: UserMessagingSystem }, { model: UserSubscription } ] })
  .then(user => {
    console.log('user = ');
    console.log(user);

I get

id: 33,
...    
updatedAt: 2021-01-06T00:27:01.416Z,
userMessagingSystems: [],
userSubscriptions: []

even though when you look in the database itself, there is clearly a row for each.

I have also tried…

User.findOne({ 
  where: {id: 33},
  include: [ { model: UserMessagingSystem, where: { salesperson: user.id } }, { model: UserSubscription, where: { salesperson: user.id } } ] })
  .then(user => {
    console.log('user = ');
    console.log(user);

I’m guessing that this is not working because there are 3 “belongsTo” between the two tables. I want the salesperson foreignKey connection, not the other two (createdBy or updatedBy). I’m guessing that Sequelize doesn’t know which I want, and automatically chooses the wrong one, or doesn’t choose at all.

Thank you for your help!