diff --git a/services/web/app/src/Features/User/UserEmailsConfirmationHandler.js b/services/web/app/src/Features/User/UserEmailsConfirmationHandler.js
index e44ab27d5f..cefae54e36 100644
--- a/services/web/app/src/Features/User/UserEmailsConfirmationHandler.js
+++ b/services/web/app/src/Features/User/UserEmailsConfirmationHandler.js
@@ -5,7 +5,7 @@ const settings = require('@overleaf/settings')
 const Errors = require('../Errors/Errors')
 const UserUpdater = require('./UserUpdater')
 const UserGetter = require('./UserGetter')
-const { callbackify, promisify } = require('util')
+const { callbackify } = require('util')
 const crypto = require('crypto')
 const SessionManager = require('../Authentication/SessionManager')
 
@@ -14,33 +14,27 @@ const TOKEN_EXPIRY_IN_S = 90 * 24 * 60 * 60
 const TOKEN_USE = 'email_confirmation'
 const CONFIRMATION_CODE_EXPIRY_IN_S = 10 * 60
 
-function sendConfirmationEmail(userId, email, emailTemplate, callback) {
-  if (arguments.length === 3) {
-    callback = emailTemplate
-    emailTemplate = 'confirmEmail'
-  }
-
+async function sendConfirmationEmail(
+  userId,
+  email,
+  emailTemplate = 'confirmEmail'
+) {
   email = EmailHelper.parseEmail(email)
   if (!email) {
-    return callback(new Error('invalid email'))
+    throw new Error('invalid email')
   }
   const data = { user_id: userId, email }
-  OneTimeTokenHandler.getNewToken(
+  const token = await OneTimeTokenHandler.promises.getNewToken(
     TOKEN_USE,
     data,
-    { expiresIn: TOKEN_EXPIRY_IN_S },
-    function (err, token) {
-      if (err) {
-        return callback(err)
-      }
-      const emailOptions = {
-        to: email,
-        confirmEmailUrl: `${settings.siteUrl}/user/emails/confirm?token=${token}`,
-        sendingUser_id: userId,
-      }
-      EmailHandler.sendEmail(emailTemplate, emailOptions, callback)
-    }
+    { expiresIn: TOKEN_EXPIRY_IN_S }
   )
+  const emailOptions = {
+    to: email,
+    confirmEmailUrl: `${settings.siteUrl}/user/emails/confirm?token=${token}`,
+    sendingUser_id: userId,
+  }
+  await EmailHandler.promises.sendEmail(emailTemplate, emailOptions)
 }
 
 async function sendConfirmationCode(email, welcomeUser) {
@@ -100,12 +94,12 @@ async function confirmEmailFromToken(req, token) {
 }
 
 const UserEmailsConfirmationHandler = {
-  sendConfirmationEmail,
   confirmEmailFromToken: callbackify(confirmEmailFromToken),
+  sendConfirmationEmail: callbackify(sendConfirmationEmail),
 }
 
 UserEmailsConfirmationHandler.promises = {
-  sendConfirmationEmail: promisify(sendConfirmationEmail),
+  sendConfirmationEmail,
   confirmEmailFromToken,
   sendConfirmationCode,
 }
diff --git a/services/web/test/unit/src/User/UserEmailsConfirmationHandlerTests.js b/services/web/test/unit/src/User/UserEmailsConfirmationHandlerTests.js
index f01a1c3250..aa447fd1e4 100644
--- a/services/web/test/unit/src/User/UserEmailsConfirmationHandlerTests.js
+++ b/services/web/test/unit/src/User/UserEmailsConfirmationHandlerTests.js
@@ -49,7 +49,7 @@ describe('UserEmailsConfirmationHandler', function () {
             getUser: sinon.stub().resolves(this.mockUser),
           },
         }),
-        '../Email/EmailHandler': (this.EmailHandler = {}),
+        '../Email/EmailHandler': (this.EmailHandler = { promises: {} }),
         '../Helpers/EmailHelper': EmailHelper,
         '../Authentication/SessionManager': (this.SessionManager = {
           getLoggedInUserId: sinon.stub().returns(this.mockUser._id),
@@ -61,23 +61,22 @@ describe('UserEmailsConfirmationHandler', function () {
 
   describe('sendConfirmationEmail', function () {
     beforeEach(function () {
-      this.OneTimeTokenHandler.getNewToken = sinon
+      this.OneTimeTokenHandler.promises.getNewToken = sinon
         .stub()
-        .yields(null, (this.token = 'new-token'))
-      return (this.EmailHandler.sendEmail = sinon.stub().yields())
+        .resolves((this.token = 'new-token'))
+      return (this.EmailHandler.promises.sendEmail = sinon.stub().resolves())
     })
 
     describe('successfully', function () {
-      beforeEach(function () {
-        return this.UserEmailsConfirmationHandler.sendConfirmationEmail(
+      beforeEach(async function () {
+        await this.UserEmailsConfirmationHandler.promises.sendConfirmationEmail(
           this.user_id,
-          this.email,
-          this.callback
+          this.email
         )
       })
 
       it('should generate a token for the user which references their id and email', function () {
-        return this.OneTimeTokenHandler.getNewToken
+        return this.OneTimeTokenHandler.promises.getNewToken
           .calledWith(
             'email_confirmation',
             { user_id: this.user_id, email: this.email },
@@ -87,7 +86,7 @@ describe('UserEmailsConfirmationHandler', function () {
       })
 
       it('should send an email to the user', function () {
-        return this.EmailHandler.sendEmail
+        return this.EmailHandler.promises.sendEmail
           .calledWith('confirmEmail', {
             to: this.email,
             confirmEmailUrl:
@@ -96,40 +95,30 @@ describe('UserEmailsConfirmationHandler', function () {
           })
           .should.equal(true)
       })
-
-      it('should call the callback', function () {
-        return this.callback.called.should.equal(true)
-      })
     })
 
     describe('with invalid email', function () {
-      beforeEach(function () {
-        return this.UserEmailsConfirmationHandler.sendConfirmationEmail(
-          this.user_id,
-          '!"£$%^&*()',
-          this.callback
-        )
-      })
-
-      it('should return an error', function () {
-        return this.callback
-          .calledWith(sinon.match.instanceOf(Error))
-          .should.equal(true)
+      it('should reject with an error', async function () {
+        await expect(
+          this.UserEmailsConfirmationHandler.promises.sendConfirmationEmail(
+            this.user_id,
+            '!"£$%^&*()'
+          )
+        ).to.be.rejectedWith(Error)
       })
     })
 
     describe('a custom template', function () {
-      beforeEach(function () {
-        return this.UserEmailsConfirmationHandler.sendConfirmationEmail(
+      beforeEach(async function () {
+        await this.UserEmailsConfirmationHandler.promises.sendConfirmationEmail(
           this.user_id,
           this.email,
-          'myCustomTemplate',
-          this.callback
+          'myCustomTemplate'
         )
       })
 
       it('should send an email with the given template', function () {
-        return this.EmailHandler.sendEmail
+        return this.EmailHandler.promises.sendEmail
           .calledWith('myCustomTemplate')
           .should.equal(true)
       })