All airdrops sent from MacBook Pro to another device failed

Also after updating the OS and still experiencing trouble, if you have a VPN/Antivirus on either device, remove it. Simply turning one off may not be enough and you would have to completely uninstall it. Apple documents the issues with VPN's and Antivirus software here where they can cause problems with communications between devices on the same network, including AirPlay and Continuity Features.

If your device has network connectivity issues, check for VPN and other third-party security software - Apple Support

For the Mac, it is possible to view the background processes that run when started up and continue where they could interfere with either sending or receiving files. The easiest way is to post the free EtreCheck report from your Mac using the Additional Text option when posting. It contains no personal information.

How to use the Add Text Feature When Post… - Apple Community

sam4211x wrote:

My Macbook Pro (2021, running on Sequoia Version 15.6.1) can no longer send airdrops to my iPad Air (running on OS 26.5) or iPhone 16. My mac is able to find both devices but when I click on them to airdrop it shows as "waiting" for a couple minutes then "Failed".

The current stable release of Sequoia including bug fixes, security updates is macOS 15.7.7

— I would start there and compare your results...

Keep your Mac up to date - Apple Support

Keep your Mac up to date - Apple Support

if you are not seeing it, you can down load directly from Apples software content delivery network (cdn) :

https://swcdn.apple.com/content/downloads/08/08/122-77920-A_24DGKW16ZQ/p2g06dyhtgf9mgf2yt1p4ihzvkkk91qvlf/InstallAssistant.pkg

excellent linkage by Mac Jim ID...

also Airdrop issues ― toggle "Everyone" and compare you results was known issue