RHEL8 - Firefox cannot play Netflix

When attempting to play Netflix content on Firefox, Netflix fails with error code F7355 which means that a browser not recognised by Netflix is used:

https://help.netflix.com/en/node/105186

I also tried the official Firefox browser downloaded from Mozilla and installed locally but the same error occurred. No problems with Google Chrome though. Note that the DRM option on Firefox is enabled. Also no such problems on Fedora 30.