Symfony主义charset问题

Question

I'm trying to learn symfony and working by various examples. The main problem is that I don't really know how to configure doctrine.yaml.

I'm using SQLSRV

When I load php bin/console doctrine:fixtures:load --append error appears: SQLSTATE [IMSSP, -48]: The encoding 'utf8' is not a supported encoding for the CharacterSet connection option.

my doctrine configuration is:

doctrine:
    dbal:
        # configure these for your database server
        driver: 'pdo_sqlsrv'
        charset: utf8
        default_table_options:
            charset: utf8
            collate: utf8_general_ci

        url: '%env(resolve:DATABASE_URL)%'
    orm:
        auto_generate_proxy_classes: true
        naming_strategy: doctrine.orm.naming_strategy.underscore
        auto_mapping: true
        mappings:
            App:
                is_bundle: false
                type: annotation
                dir: '%kernel.project_dir%/src/Entity'
                prefix: 'App\Entity'
                alias: App

also I tried default configuration:

 charset: utf8mb4
    default_table_options:
        charset: utf8mb4
        collate: utf8mb4_unicode_ci