Unable to sign in from desktop app (MacOS)

Hi,

I’m running on an Apple MacBook Pro 2020.
MacOS BigSur 11.2.3
WD Discovery 4.2.288

When I try to sign in with the desktop app, I enter my email address and password. Then, the “sign in” button rotate infinitely.
What could I do ?
I can back-up with Time Machine but it is not possible to access my medias with my mac.
Note that I can access all my datas from my iPhone.

Thank you by advance,

Rémail