Azure DevOps Agent won't start and shows: Error 1 Incorrect Function - Service could not start

Question

I configured the build agent as a service but when I go to start the agent I get the error:

Error 1 Incorrect Function - Service could not start

Azure DevOps Agent configured as a service but service does not start

Answer 1

Copied from the comments:

ok ill answer my own question, when the config.cmd command is run, it allocates the network service as the account to run the service. However it does NOT automatically give permissions to where the agent folders are installed. So it fails to run. Stupid as this should be flagged when running the config.cmd command! The error message is nonsense and misleading. So if the agent is in c:\users\abc\agent you need to give the network service permissions to access that folder!