Can't make the bundle to deserialize enums

[lucianull]

Context:
I have a base class object:

namespace App\Model\Event;

use App\Enum\NotificationTypeTagsEnum;
use App\Model\SuppliersPortal\RequestBody\ActivateAccountModel;
use App\Model\SuppliersPortal\RequestBody\UnknownUnitOfMeasureModel;
use Symfony\Component\Serializer\Attribute\DiscriminatorMap;
use Symfony\Component\Validator\Constraints as Assert;

#[DiscriminatorMap(
    typeProperty: 'notificationTypeTag',
    mapping: [
        NotificationTypeTagsEnum::SUPPLIERS_PORTAL_ACTIVATE_ACCOUNT->value => ActivateAccountModel::class,
        NotificationTypeTagsEnum::SUPPLIERS_PORTAL_UNKNOWN_UNIT_OF_MEASURE->value => UnknownUnitOfMeasureModel::class,
    ]
)]
class EventBodyModel
{
    public function __construct(
        #[Assert\NotBlank(message: "Notification type should not be blank.")]
        public ?NotificationTypeTagsEnum $notificationTypeTag
    ) {}

    public function getNotificationTypeTag(): ?NotificationTypeTagsEnum
    {
        return $this->notificationTypeTag;
    }

    public function setNotificationTypeTag(?NotificationTypeTagsEnum $notificationTypeTag): self
    {
        $this->notificationTypeTag = $notificationTypeTag;
        return $this;
    }
}

A class that extends it:

<?php

namespace App\Model\SuppliersPortal\RequestBody;

use App\Model\Event\EventBodyModel;
use App\Utils\Interfaces\ArrayableInterface;
use Symfony\Component\Validator\Constraints as Assert;


class ActivateAccountModel extends EventBodyModel
{
    public function __construct(
        #[Assert\NotNull(message: "First name should not be null.")]
        private ?string $firstName = null,

        #[Assert\NotNull(message: "Last name should not be null.")]
        private ?string $lastName = null,

        #[Assert\Url(message: "Activation link should be a valid URL.")]
        private ?string $activationLink = null,
    ) {
    }

    public function getFirstName(): ?string
    {
        return $this->firstName;
    }

    public function setFirstName(?string $firstName): self
    {
        $this->firstName = $firstName;

        return $this;
    }

    public function getLastName(): ?string
    {
        return $this->lastName;
    }

    public function setLastName(?string $lastName): self
    {
        $this->lastName = $lastName;

        return $this;
    }

    public function getActivationLink(): ?string
    {
        return $this->activationLink;
    }

    public function setActivationLink(?string $activationLink): self
    {
        $this->activationLink = $activationLink;

        return $this;
    }
}

And i try to store this object in the db, in an entity field:

...
class Event
...
    #[ORM\Column(type: 'json_document', nullable: true, options: ['jsonb' => true])]
    private ?EventBodyModel $data = null;
...

And when i try to get an event entity from the db I am getting the following error:
Failed to denormalize attribute "notificationTypeTag" value for class "App\Model\SuppliersPortal\RequestBody\ActivateAccountModel": Expected argument of type "?App\Enum\NotificationTypeTagsEnum

Am I doing something wrong or why notificationTypeTag is not deserialized back from string to NotificationTypeTagsEnum?

[RafaelKr]

For me it works as expected. Could it be that you're using a non-backed enum? The Enum must be a BackedEnum so the serializer is able to map it correctly.