Some additionnal info:

the link: https://dataservice.accuweather.com/currentconditions/v1/962177?apikey=XtGautkvuQjpSIsXXX46nnFAnA2CQeM7&lang=fr&details=true

(I changed some characters in the API key => the link above will not work as such)

But the link does work with the right key and proves ...

Well, same problem here.

The API key is correct, I tested it on accuweather website
The location is 962177 and is also correct, as tested on accuweather website.

The location in setup screen has been set as follows:
962177
50.475,3.907 (doesn't work), although it's the Long LAt given by ...