If you don’t see Grammarly in the list of available keyboards, please check your iOS version first by going to Settings > General > About. 

Then, follow the steps below depending on your iOS version: 

iOS 15.3 and older

To resolve the issue, please install the latest iOS updates by following these instructions.

iOS 15.4 and newer
  1. Restart your device
  2. Go to the Settings app > General > Keyboard > Keyboards > Add New Keyboard, and try adding any other keyboard to the list: