Send notification by users

Hi, i have a field service app and i want to send a notification to their smartphones when i open a service at the app.

So i’m trying to do it using workflow with this condition:

useremail()=[_Thisrow].[email]

But it’s not working, is there any way to do this?
we have almost 20 users and i want that only who will get the service been notified.

This might help

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