@svjs-0437 , Thanks for the update. I am glad to hear that the cause is found, Congratulations! Here, please let me write a summary for our issue:
Issue Definition:
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Some win 32 apps failing at ESP with error code 1618 or unknown errors for hybrid AAD windows autopilot
Cause and Resolution:
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1618 means "Another installation is already in progress. Complete that installation before proceeding with this install.". Investigating and find the office installed from intune is causing the issue. it uses MSI installer causing other MSI based win32 app to fail. It is working when office is excluded from the target.
Thanks for your time and have a nice day!