I want to apply different values for each user

[tatiang]

Try this. I would test it without the Navigate block. You might need a slight delay between the cloud variable block and the Navigate block so leave it out for now. If the =null condition doesn’t trigger when you first sign in, then you may have to check the properties of Users/ or whatever your top Firebase level is for the existence of [user id] but I think the =null condition will work. Make sure you are using an account that has been verified by clicking the link your receive from Firebase in your email account.