The PS5™ version of Arknights: Endfield supports the Americas / Europe server and the Asia server.
When you log in on PS5™, the game server will be automatically assigned based on the region of your PSN account. Manual server selection is not currently supported.
Examples
1. If your PSN account region is North America, you will be assigned to the Americas / Europe server.
2. If your PSN account region is Hong Kong, you will be assigned to the Asia server.