messaging().getToken() generates same device token for different devices - firebase

Question

I got an issue with fcm tokens, they are identical for some devices (as you can see from screenshot). On internet it is said that they should be unique for each device, but it seems that in our case they are not. This is the way how I get fcm tokens from messaging library (react native firebase):
export const AppMaintainer = () => {
const fullname = useAppSelector(getMyFullName);
const photoUrl = useAppSelector(getPhotoUrl);
const userDocId: string = useAppSelector(getCurrentUserDocId);
const token: TokenOrProvider = useAppSelector(getCurrentStreamToken);
const dispatch = useAppDispatch();
useEffect(() => {
dispatch(actions.authStateChangeUser());
}, []);
const requestUserPermission = async () => {
const authStatus = await messaging().requestPermission();
const enabled =
authStatus === messaging.AuthorizationStatus.AUTHORIZED ||
authStatus === messaging.AuthorizationStatus.PROVISIONAL;
if (enabled) {
console.log('Authorization status:', authStatus);
const deviceToken = await getFcmToken();
try {
await firestore()
.collection('usersDescriptiveData')
.doc(userDocId)
.update({
deviceToken,
});
} catch (error: any) {
console.log('error in deviceToken update');
dispatch(
globalActions.setIsGlobalSnackbarVisible({message: error.message}),
);
}
}
};
const getFcmToken = async () => {
try {
const fcmToken = await messaging().getToken();
return fcmToken;
} catch (error) {
console.log('error in fcm', error);
}
};
useEffect(() => {
if (userDocId && photoUrl && token && fullname) {
requestUserPermission();
}
}, [userDocId, photoUrl, token, fullname]);
return (
<>
<NavigationContainer ref={navigationContainerRef}>
<RootNavigator />
</NavigationContainer>
<NetGlobalSnackbar />
</>
);
};
Could you please say what i am doing wrong?
Package.json:
"react-native": "0.69.6",
"#react-native-firebase/messaging": "12.9.3".
Additionally, I assume that these duplicated tokens are the reason why some users get notifications more then two times (but this is another story).
I tried calling the getFsmToken function again when deviceToken was already in use by another user, but it didnt help. Additionally, tried deleting and generating the deviceToken again, but it didnt help too. I expected this token to be unique for each device, but it is not, which means i am doing something wrong. FYI: i dont do it with browser, the app is available on stores and some users get the same token for their devices
Could anyone guide me with this?