Wifi Connection Issue with 4stream on IOS 18

Hi,
Am using up2stream mini V3 for my project and it’s getting difficult to connect to the wifi through 4stream App.

Am using 5 mini V3s for multi room functionality but nothing is getting connected.
This is 4stream app on the iPhone with IOS 18.

Is it because of some firewall?
I also have ACP work Bench, can I put the wifi credentials through the ACP tool?

Request you to help and the project is for a client.

Thanks