Elastic Beanstalk with Loadbalancer - No Data from Instance for new Environments

Hello, we have multiple environments with the same configuration: Application Loadbalancer with min 1 / max 1 t2 instance, to assign SSL certificates. Loadbalancer in subnet a and b, instance in subnet b. I created some in the past, the last 1 month ago. And all work fine. But now when i create a new one with default settings and example application, it wont work with the loadbalancer. I tried a few times with PHP 8.1 and Node 18, configuration is the same as the current working environments. Elastic Beanstalk gets Status No Data, cannot communicate with the instance. The EC2 instances get no IPV4-DNS, in the past every instance automatically got the IP. Dont know if it is the only problem here. If i switch to single instance, everything works. Has something changed with the loadbalancers? Are there default security groups that i have to use to get it work?

Thanks in advance.

Best Regards, Andreas