The ACE COMBAT 8 team is preparing an update with fixes and gameplay adjustments. Its release date and final contents will be announced once they are settled.
The developer is also investigating difficult mission matchmaking in Online Mode. Unsupported PC environments are identified as one possible contributing factor, rather than the sole proven cause of every failure. The announcement reiterates official Windows 11 support and recommends installing the game on an SSD: an HDD may affect loading and matchmaking stability. This guidance does not guarantee that changing drives resolves every connection issue. It applies to PC environments, rather than serving as console instructions. Investigation continues, and this is an update plan rather than a notice that the patch has already shipped.
Sources and checks
Upcoming Update Plans for ACE COMBAT 8 and Matchmaking Status in ONLINE MODE · Steam