My Apple Magic Keyboard doesn’t work with my iPhone but is fine with my ipad.

OK, so i have an apple Magic Keyboard which i mostly use with my iPhone. But a few weeks ago the iPhone suddenly stopped responding to the keystrokes on the keyboard. (Other than the space bar which now brings up a series of menus).

I managed to solve the issue (but only temporarily) by doing some kind of reset which involved me holding down two keys (like shift, fn) and then other two keys RP, if someone could help me by letting me know which two keys I should hold down with R+P then id very much appreciate it!

Or any other way to solve this.