How to have two different roles for two different apps?

I have a system wherein I have two apps. One for user and one for gym owner.
I have set a True/False field which is used to check what is the role (user or owner), and only if he has signed into the correct app he’ll be allowed to explore the app further.

The problem is, say if there are both the apps on same phone, then there’s a chance of user getting access of gym app or vice versa. What can I do to solve this ?

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