So when I talk to Ratagos about duties he says "What can I do for you, Patriarch?"

From my understanding it should have been this response instead:
"It is a privilege to receive the %PCRank of Vvardenfell. Should you wish to personally take charge of our duties, we need to deliver a message to Port Telvannis. Or perhaps you would prefer to learn about our pilgrimages on the mainland?"

As a workaround I edited the "duties" dialog and placed the latter response above the former so it would get triggered.

I don't know if it's intended behaviour or a bug, but I figured I'd report it just in case.