Hello there!
We came across your post and we wanted to give you a hand with your situation. We understand you are having issues to pair your Quest 3s to your computer using the Meta Link app since it takes too long to connect properly even after updating and reinstalling the app multiple times. One of the possible roots to this issue could be the configuration of your Antivirus/Firewall that could be preventing your Meta device to communicate with our servers.
One of the possible solutions would be adding the the Meta Link App to your antivirus exceptions. Please, find attached our public guide on this subject by click here: Troubleshoot antivirus blockage.
If after adding the Meta Link app you find yourself struggling with the same issue, send us a quick private message by clicking on our profile picture or through the following link and we will proceed with further steps: https://www.meta.com/help/support/
Many thanks for your patience and efforts while being part of this process with us. We will be looking forward to hear from you!