How to use /give commands to create a written book in Minecraft Pocket/Bedrock (iOS)? [duplicate]
Solution 1:
You can't use the "/give" command to get a "written_book" in Bedrock Edition (Android, iOS, Windows 10, etc.)
Someone posted a bug report to Mojang here: https://bugs.mojang.com/browse/MCPE-34741
I tried the command myself in Windows 10 Bedrock and got the same error you and the person reporting a bug had.
It seems the Bedrock devs didn't feel a need to add the "written_book" item ID yet because they closed the bug report, saying it was a "feature request or a suggestion"