Hi Odegbune,
I am Dave, I will help you with this.
1
When you press the keys for the backslash and forward slash, what happens is another character types?
2
Bring up the on-screen keyboard, do those slash keys work on that keyboard?
3
Open the Settings app, then go to Time and Language - Language and Region
Is the correct keyboard language set for your physical keyboard in the Preferred Languages section?