Airdrop failing

I am experiencing persistent AirDrop issues on my iPhone 16 Pro (iOS 17.0.3) and both my MacBook Pro 14” (Sonoma 14.1) and MacBook Air 13 M2, disrupting my workflow for over six months. Despite exhaustive troubleshooting, including Wi-Fi and Bluetooth resets, software updates, and even system reinstalls, the problem endures. The items are recognised, I just always get a “failure” notice. The correct device name appears for AirDrop etc.

Very occasionally a duplicate listing with an incorrect icon appears and the - and only then - a file transfer will work.

This issue has not only persisted across different phones but also through recent software updates and even after a complete reinstallation of the operating system on my MacBook Pro.