Here are Let’s Fix It Top Tips for activating the Siri Icon on the keyboard for iPhone and iPad.
For Siri to be active your iPhone / iPad must be connected to Wifi or Cellar.
If that didn’t activate Siri on the keyboard, follow these instructions –
Settings > General > Keyboard – Enable Dictation
Settings > General > Restrictions – check restriction for Siri & Dictation is not enabled
Settings > General > Siri – disable then re-enable Siri. Restart your iPhone / iPad to reboot your settings.
Please comment if this helped you OR if you have another way of solving this problem.
Why is Siri Icon Greyed out on keyboard? - Let's Fix It