Please do recheck all relevant settings and permissions @Nour both in your phone , the Netflix app too.
Is this happening on both Wi-Fi and Mobile Data ?
You can try resolving this via clearing the apps cache and if necessary Data in Settings, Apps, Netflix, Storage, Clear them there.
Another option is to delete the app off your phone and in your MyLibrary in your Playstore and then re download a fresh copy of the app.
Try a Google Search of your issue if you haven't already.
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.The advice I offer is my own and does not represent Samsung’s position. I'm here to help.