Unable to insert id into a table that belongs to a foreign key referenced table using Sequelize

I am building serverless application using node js and using claudia-api-builder as a framework to launch APIs in AWS.

In app.js file, i call the required api as

const ApiBuilder = require('claudia-api-builder');
const api = new ApiBuilder();
module.exports = api;

api.post('/api/auth/validatephonenumber', async function (request) 
{
    return new Promise((resolve, reject) => {
        index.loadDatabase().then((db) => {
            resolve(loginController.validatePhonenumber(db, request));
        });
    });
});

Below is my code:

async function validatePhonenumber(db, request) {
return new Promise(
    async (resolve, reject) => {
        let emailid;            
        await db.EmailRegistration.sync().then(function () {
             emailid = db.EmailRegistration.findOne({
                where: { email: { [Op.eq]: mailid } },
                attributes: ['id'],
            });
        });
        if (emailid != null) {
            console.log(`email id: ${emailid.id}`);
            await db.ContactDetails.sync().then(function () {
                db.ContactDetails.findOrCreate({
                    where: { contactnumber: phnum },
                    defaults: { EmailRegistrationId: emailid.id },
                }).spread((contactdetails, created) => {
                    console.log(`contactdetails: ${contactdetails}`);
                    if (contactdetails !== null) {
                        resolve({ statuscode: indexController.statusCode.statusOK, contactdetails: contactdetails })
                    } else {
                        reject({ statuscode: indexController.statusCode.InternalServerError, message: 'phone number not created' });
                    }
                });
            });
        };
    });
}

I am trying to add a emailregistrationid of EmailRegistration table into ContactDetails table as a foreign key reference. I am using sequelize with mysql, nodejs to achieve the desired results. But, i am getting below error:

Unhandled rejection SequelizeForeignKeyConstraintError: Cannot add or update a child row: a foreign key constraint fails (inmeeydb.ContactDetails, CONSTRAINT ContactDetails_ibfk_1 FOREIGN KEY (EmailRegistrationId) REFERENCES EmailRegistration (id) ON DELETE CASCADE ON UPDATE CASCADE)

Below is my EmailRegistration models file:

const moment = require('moment');

module.exports = (sequelize, DataTypes) => {
const EmailRegistration = sequelize.define(
'EmailRegistration',
{
  id: {
    type: DataTypes.UUID,
    primaryKey: true,
    allowNull: false,
    defaultValue: DataTypes.UUIDV4,
  },
  email: {
    type: DataTypes.STRING(50),
    allowNull: false,
  },
  password: {
    type: DataTypes.STRING,
    allowNull: false,
    validate: { min: 6 },
  },
  createdAt: {
    type: DataTypes.DATE,
    get() {
      return moment.utc(new Date(), 'DD/MM/YYYY h:mm a').format('DD/MM/YYYY h:mm a');
    },
  },
  updatedAt: {
    type: DataTypes.DATE,
    defaultValue: null,       
  },
},
{
  freezeTableName: true,
}
);

EmailRegistration.associate = function (models) {
    EmailRegistration.hasOne(models.ContactDetails,
        { foreignKey: 'EmailRegistrationId' }
    );
};

return EmailRegistration;
};

Below is my Contactdetails models file:

const moment = require('moment');

module.exports = (sequelize, DataTypes) => {
const ContactDetails = sequelize.define(
'ContactDetails',
{
  id: {
    type: DataTypes.UUID,
    primaryKey: true,
    allowNull: false,
    defaultValue: DataTypes.UUIDV4,
  },
  contactnumber: { type: DataTypes.STRING(13), allowNull: false },
  isverified: { type: DataTypes.BOOLEAN, defaultValue: false },
  createdAt: {
    type: DataTypes.DATE,
    get() {
      return moment.utc(new Date(), 'DD/MM/YYYY h:mm a').format('DD/MM/YYYY h:mm a');
    },
  },
  updatedAt: {
    type: DataTypes.DATE,
    defaultValue: null,        
  },
},
{
  indexes: [{ fields: ['contactnumber'], unique: true }],
},
{
  freezeTableName: true,
}
);

ContactDetails.associate = function(models) {
ContactDetails.belongsTo(models.EmailRegistration, {
  onDelete: 'CASCADE',
  hooks: true,
  foreignKey: { allowNull: false },
});
};   


return ContactDetails;
};

I tried to change the code as below with reference in both tables, but nothing worked.

ContactDetails.associate = function(models) {
    ContactDetails.belongsTo(models.EmailRegistration,
    { foreignKey: 'EmailRegistrationId' }
    );
};

Not able to analyze how to overcome the issue. This worked fine when i used nodejs with expressjs and had no issues. It fails to identify the EmailRegistrationId(that is missing in the query) in ContactDetails table and shows the output as

INSERT INTO `ContactDetails` (`id`,`contactnumber`,`isverified`,`createdAt`,`updatedAt`) VALUES ('52974e07-8489-4101-ab71-6af874903290','+xxxxxxxxx',false,'2018-10-12 08:55:35','2018-10-12 08:55:35');

You need to update the configuration of your association. The ContactDetails model will now have a field called emailregistrationid

EmailRegistration.associate = function (models) {
  EmailRegistration.hasMany(models.ContactDetails);
};

ContactDetails.associate = function(models) {
  ContactDetails.belongsTo(models.EmailRegistration, {
    onDelete: 'CASCADE',
    hooks: true,
    foreignKey: {
      name: 'emailregistrationid'
      allowNull: false
    },
  });
}

ContactDetails.create({
  ...
  emailregistrationid: <some_valid_emailregistrationid>
})