Questions about Nikon D5600

According to the information, there is only the 24-month limited warranty and not the 3-year Nikon Switzerland warranty, although Digitec is a Nikon dealer. Does Digitec generally not provide the 3-year warranty for this product or can it be purchased for an additional charge?

Coucou vous allez bien un petit soucis avec mon appareil d5600. When I want to take a shot with the viewfinder, the focus is done with only one collimator. I can put myself in 11 or 39 dynamic points, selective zone, AFS, AFC etc...it's the same. Could you help me? It's just that when I use the automatic zone all the collimators are displayed and when I release they disappear so I can't do anything. Normally in the other modes I'm supposed to have all the collimators and choose the one I want to focus on, do we agree? Have a nice day :)

Is there a smallrig cage for this body and if so which one?

Will the lens from my old Nikon D3100 fit on this body?

is this presi incl. the Nikon action of 100.- or will this deduction be added afterwards?

Is there a charger for the Nikon D5600 battery that works via USB connection?

I would like to buy a new Nikon but am undecided between the D5600 and the D7500. What are the arguments in favour of the two if I want to shoot landscapes or even some sports? Or are there reasons that clearly speak for the other?

I have heard that this camera can filter out one colour and the rest is displayed in black and white. Is this true? Do you have any experience with this?

Is the camera compatible with a TC-20E AF-S teleconverter III?