First question, do you know what the "Silly Block" was? The process only lasted about 4 minutes, so it does seem to be during the compatibility checks. It may be something that happened just above in what you show from the log. Perhaps something that has a MIG instead of a MOUPG ID.
Error means:
0xC1900209 The user has chosen to cancel because the system doesn't pass the compatibility scan to install the update. Setup.exe will report this error when it can upgrade the machine with user data but cannot migrate installed applications. Incompatible software is blocking the upgrade process. Uninstall the application and try the upgrade again. See Windows 10 Pre-Upgrade Validation using SETUP.EXE for more information.
D SP_EXECUTION_OP_MIGRATE_DATA
That doesn't fit and does not make any sense.
I did not cancel anything. MS did after several minutes checking for updates.
Now today I got this message:
The "Learn More" points to the link below which is again quite useless. 🤣🤣
Safeguard holds affecting your device | Microsoft Learn
Windows 10 Pre-Upgrade Validation using SETUP.EXE - Microsoft Tech Community
This link below is pretty useless too, no explanation about the reason for the safeguard holds.
KB5006965: How to check information about safeguard holds affecting your device (microsoft.com)