Hi PapoMorales,
Thanks for reaching out to Microsoft Community and posting your inquiry.
I found a thread related to this issue: https://answers.microsoft.com/en-us/surface/forum/all/i-am-not-able-to-make-video-and-audio-calls-from/e81eef30-34b6-4c21-bf14-22b86116116d?page=1
Try to uninstall and re-install the app and see if it will work on your end otherwise, we suggest reporting this issue to the Whatsapp support.