The web application, which is often repacked into "native" applications, doesn't support calling. Waydroid doesn't support audio/video in/output for WhatsApp according to various Github threads.
Your best bet may be to set up Android-x86 in a virtual machine and using USB forwarding to get video working. I'm not sure what you'd need to get sound working, though.
It's also possible that Google's development emulator can run this stuff, I recall it having a webcam forwarding feature at least, but I don't know about audio or if WhatsApp will work on there.
They don't support calling in any browsers. If I recall correctly they're using some kind of native library to encrypt and transcode the video, which the browser obviously can't use. You need to get the native app on Windows and macOS.
Using an Android emulator like Waydroid or compatibility layer like Anbox you might be able to use the Android version on Linux and pick up calls from there?
I have good experiences with Waydroid, but no experience with WhatsApp so I can't guarantee it will work, it's just a suggestion that I hope will help
My supervisor was an FOSS guy. He used Linux, Libreoffice everything but he still insisted on whatsapp for informal communication. I guess network effects is hard to avoid.
People who say this in response to a request for help should just be perma-banned. Just get rid of them flat out. It’s the sure sign that someone is a total buffoon and will only ever make the place worse.
I think there's value in pushback against popular but problematic software. Some people just don't realize that, for example, WhatsApp is owned entirely by Meta and is known to collaborate with law enforcement, which are two facts that entirely undermine its main selling point.
Ah yes, the obligatory "lol just don't use $thing" response. Helps nobody, but I guess it lets you feel superior.
I hate Facebook as much as anyone, but in the real world people don't always have the luxury of getting to use whatever you consider morally correct. Especially with a messenger – depending on where you are, Whatsapp might just be what most people are using, and the people are the reason you would use a messenger in the first place.
Ah yes, the obligatory "superiority" response. Because it's nothing to do with trying to improve your situation or preserving your rights or the rights of others, it's only about "superiority" LOL
I hate Facebook as much as anyone
I don't think you do.
in the real world people don't always have the luxury of getting to use whatever you consider morally correct.
Yes. They do. And the world is a shit place because they choose not to.