Issue in serlaization at AccessTokenInterface when app.store.authorize is triggered

[a7medKhalid]

Symfony\Component\ErrorHandler\Error\FatalError: During inheritance of JsonSerializable: Uncaught ErrorException: Return type of League\OAuth2\Client\Token\AccessTokenInterface::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /Users/afaq/Documents/salla/dsjkgh/vendor/league/oauth2-client/src/Token/AccessTokenInterface.php:71

After adding #[\ReturnTypeWillChange] attribute before this function and now the issue error disappears but another issue occurs
League\OAuth2\Client\Provider\Exception\IdentityProviderException: Please provide a valid authorization token in file /Users/afaq/Documents/salla/dsjkgh/vendor/salla/ouath2-merchant/src/Provider/Salla.php on line 88

and I think the cause of it is the serialization type