This is a strange one. Apparently, the Olympus OM-D Webcam Beta software that Olympus released to allow you to use your Olympus OM-D mirrorless camera as a USB webcam has ceased to function. As of January 1st, 2021, it just quit working without warning. And, sure, you can change your computer’s clock to trick it, but then that can potentially cause other issues if you want to actually use it.
Olympus has acknowledged the issue and says that their R&D team have identified the problem, with a new and fixed version of the software on the way “as soon as possible”. With the transition of “OM-D” from Olympus to Japan Industrial Partners (JIP), though, who knows how long this may take. And who even owns the rights to the software anymore?