Full Access still off? What to check
Full Access is a separate switch from the OnKey keyboard switch, and it is easy to miss.
Steps
Open Settings again. Settings, then OnKey, then Keyboards.
Look for the second switch. Switching OnKey on is not enough. Allow Full Access is its own switch inside the same OnKey row.
Switch on Allow Full Access. Turn it on and confirm the iOS warning.
Come back and try an action. Open a text field, switch to OnKey and tap Fix.
Still stuck?. Switch OnKey off and on again in Keyboards, then switch Full Access on once more.
Questions
Can I use OnKey without Full Access?
You can type. The AI actions need Full Access, and the keyboard tells you so.
It says it cannot reach the AI.
Full Access may be on while the connection is down. Check your internet connection and try again.