PC and PS5 Crossplay Co-op Squad Battles bug (No progress for guest)

Hello,I am experiencing a persistent issue while playing Ultimate Team Co-op Squad Battles with a friend. I am playing on PC, and my friend is on PlayStation 5. Crossplay is enabled for both of us, and we are running the correct game versions.

Every time we finish a match, the guest player (the one who was invited to the lobby) gets disconnected with the error message: "The EA servers were unable to process your request. Please try again later."

As a result, the guest player gets a technical defeat (0 points), and their objective progress is NOT counted. Meanwhile, the host player receives the points and successful objective completion.

If we switch roles (PS5 player invites PC player), the issue mirrors exactly: the PC player gets disconnected at the end of the match and receives no progress, while the PS5 host gets it. This issue does not occur when playing with random players on the same platform.

Please investigate this server synchronization bug between PC and PS5 in Co-op mode. Thank you.