Start with raspi 3 and pi camera

Hi boys ! I decided to a school project to create a polaroid. It's my first time on raspberry but i don't scare of it. When i follow the step of the official youtube channel to connect my camera and i execute

libcamera-still -o test.jpg

I've an error which says the raspi can't authentificate with the camera. Yet, the camera led is turn on... so i was thought it was from the raspberry so i reinistall pi os on by i've got the same error. My camera is a raspberry pi camera B with a lens and my raspberry is a pi 3 b+ If someone has a solution ? Thanks a lot for your answers

If you have some advices for my project, i'm very curious about it

First try unplugging it and cleaning it with isopropyl alcohol then replying it

ok i will test it thanks

but the led of the camera is on...

Yeah that's what's surprising

Still it may be the power pins are fine but not the data pins

and what can i do ?

it's just broken ?

have you done this?

i will do it now

so i just clean it, dry it and replug it

is it works with an alclhol vinaiger ?

should do i think.. wipe it afterwards

no it doesn't work, i've got the same error "Failed to authenticate"