If you disable Norton Secure VPN, does the airdrop feature work?
Do you also have Norton Security for iOS installed? If so, try disabling the Web Protection feature and test the airdrop feature.
The next step I would try for diagnosing the issue is to uninstall Norton Secure VPN and then test. If airdrop still does not work, uninstall Norton Security for iOS and test.
If you still have trouble with airdrop, you would need to look at other settings and apps that might be interfering.
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