How do I knon the expo token for pushing notification is changed?

Hi there,

I recently met a problem is that the expo token is changed for application but our FE doesn’t know that and update the know expo token into our BE database. However, the old expo token is still there so that we will receive double notifications in this case. Could you please tell me how to know whether expo token is refreshed and why the old token is still working? Thank you!

Regards,
Will