Custom GraphQL queries not working

I’m just going to show a basic example because nothing works.

I have etc/schema.graphqls with the following example:

type Query{
    fiservGenerateTokenHash: TokenHash @resolver(class: "Vendor\Module\GraphQL\TokenHash")
}

I then have the TokenHash resolver:

<?php

namespace VendorModuleGraphQL;

use MagentoFrameworkGraphQlQueryResolverInterface;
use MagentoFrameworkGraphQlQueryResolverContextInterface;
use MagentoFrameworkGraphQlSchemaTypeResolveInfo;
use VendorModuleServiceEncryption as EncryptionService;
use MagentoFrameworkGraphQlConfigElementField;

/**
 * Class TokenHash
 * @package VendorModuleGraphQL
 */
class TokenHash implements ResolverInterface
{
    /**
     * @param EncryptionService $_encriptionService
     */
    public function __construct(
        private readonly EncryptionService $_encriptionService
    )
    {

    }

    /**
     * @param Field $field
     * @param ContextInterface $context
     * @param ResolveInfo $info
     * @param array|null $value
     * @param array|null $args
     * @return array
     */
    public function resolve(Field $field, $context, ResolveInfo $info, array $value =null, array $args = null)
    {
        $tokenHash = $this->_encryptionService->generateNewHashBySessionId();

        return ['token'=>$tokenHash];
    }
}

Now, when i run the basic test in postman to https://mydomain.com/graphql:

query {
    fiservGenerateTokenHash {
        token
    }
}

All i get is this error: Cannot query field “fiservGenerateTokenHash” on type “Query”

I can’t find any info on this, i’m doing exactly how it’s documented everywhere.