Strapi - Update Additional Fields on User Model - rest

Question

Problem Statement: Able to register user but unable to update customFields on same model in single request. Detail explanation below.
I have added additional fields to UserModel on Strapi. UserModel Attached
I am building a front end using Nuxt, where admin user can create new users who can access the website. This is not Regular Signup, This is User getting created by admin of the site. I guess even a regular signup I would face this issue.
Admin has all the rights to crud users.
When I submit the form I am getting Forbidden error. Form Attached
Below is my code which handled the submit. I first register the user and based on the user id I try to update First Name and Last name.
handleSubmit() {
if (this.$refs.form.validate()) {
this.loading = true
// console.log(this.username, this.email, this.password)
strapi
.register(this.username, this.email, this.password)
.then(response => {
console.log(response)
strapi
.updateEntry('users', response.user.id, {
firstName: this.firstname,
lastname: this.lastname
})
.then(response => {
this.loading = false
this.$router.push('/users')
})
.catch(err => {
this.loading = false
// alert(err.message || 'An error occurred.')
this.errorMessage = true
this.errorMessageContent = err.message || 'An error occurred.'
})
})
.catch(err => {
this.loading = false
// alert(err.message || 'An error occurred.')
this.errorMessage = true
this.errorMessageContent = err.message || 'An error occurred.'
})
}
}
Below is the console message.

Answer 1

Do you want to update the additional user fields (using PUT method) or passing them to the back-end in the register process (using POST method) ?
If you want to update them, you have to do the following:
Adding fields to you user model (already done)
Make the /update endpoint available in the users-permissions configuration.
See screenshot:
Now you are able to use the PUT method on the endpoint users/:id, which you could do e.g. like this: