Same problem here today: we have random notarization failures, some of them with internal server errors (500), some of them with missing agreement.

My problem seems to be pretty similar to the one reported in rdar://FB13278576

I can reproduce the same problem when compiling my sample project using Xcode 16 RC and Xcode 16.1 ß: Sep 11 10:44:41 10 sandboxApp[974]: dyld: Symbol not found: _$s7Network13NWPathMonitorCMa Referenced from: /Users/test/Desktop/sandboxApp.app/Contents/MacOS/../Frameworks/IntegoFoundation.framework/Versions/A/IntegoFoundation Expected in: /System/Library/Frameworks/Network.framework/Versions/A/Network

After some time monitoring the problem on our user base, it seems we were able to fix the problem. Our approach was to consider that we were probably receiving an auth event at a time we had no more access to the CPU. So we listed system processes that were active during the sleep process, identified all system processes that we can mute, and muted them. One of the process was /usr/libexec/endpointsecurityd, that sounds like a good candidate. After a few weeks with the product in the wild, we didn't receive new KP feedback. Thanks Kevin for your help !