I Face Google Play Games 403 Error in Bus Simulator Ultimate Login

I recently installed Bus Simulator Ultimate on my device, but I cannot log into my Google Play Games account. Each time I attempt to sign in, the game shows a 403 error and blocks the login process. To test whether this was specific to the bus simulator, I also tried the same login with Truck Simulator Ultimate, and unfortunately I experienced the exact same 403 error there as well.

Since my accounts and progress are linked to Google Play Games, this issue prevents me from saving my progress or accessing my existing game data. I have already attempted reinstalling and retrying multiple times, but the error persists.

I kindly request that this technical problem be resolved quickly so I can log into my account without errors and enjoy the games as intended. Please ensure that Google Play Games login integration is fixed across both Bus Simulator and Truck Simulator Ultimate.