@Andy ***********
Maybe I try just do by registered mail next time, but you asked to show an official asking to say it has to be in person, and I just showed you.
No idea if the online system is making difference for regions.
I not have to choose an office online, but the system might do depending on address of course.
Anyway I did go to the office, the desk employee looked at my passport and documents and asked if I need extension, so she did not look very well when I still have over 90 days on my stamp and hand over a TM47 and TM30.
I said I wanted to do 90 day reporting, she took documents, no further questions and within 3 minutes another officer handed me over my passport and a TM47 receipt.
I wonder why I needed to be there in person...