Airdrop option not showing

Go to Settings > Screen Time. Tap Content & Privacy Restrictions. Tap Allowed Apps and make sure that AirDrop is turned on.

How to use AirDrop on your iPhone, iPad, or iPod touch

1. Go to Settings > Screen Time.
2. Tap Content & Privacy Restrictions.
3. Tap Allowed Apps and make sure that AirDrop is turned on.

Then restart the phone