MismatchSenderId error on FCM Token

Hello everyone. In Expo, I’m getting the device token like this: const token = (await Notifications.getDevicePushTokenAsync()).data; and then sending it to my Spring-boot notification backend service that I own. However, I’m receiving a “mismatchSenderId” error. I’m runnig this application without android-build. How can I fix this mismatchSenderId exception?