Signtool returns error 0x800700C1 while trying to sign AutoCAD OEM 2023 setup.exe

Also, if there are any you will want to check the ODIS logfiles very carefully.
.\APPDATA\Local\Autodesk\ODIS
You could also try the log collection tool noted here but you may need to be farther along in the install to get anything useful:
Troubleshooting installation issues OEM