Is this also the case with the Elite 75t wireless earbuds?
Your experience is the same to mine - but 'unsupported' is a misnomer; in my opinion it's deliberate on Jabra's part so they don't cannibalise their own business-ware sales with the cheaper consumer-ware products. I got a Link 370 (a Jabra bluetooth adapter) and the 85h pair up perfectly now for Zoom and Teams calls.
Similar experience to myself.
I got some of these before Xmas (from Amazon) hoping to get some decent multipoint support - I wanted to pair them with my phone and laptop and be able to switch between the two automatically i.e. listen to music on my phone, switch to a zoom call on the laptop automatically and back. After much trial-and-error, I could only get it to work one way i.e. answer to zoom and it seemed to lose the pairing between the two devices afterwards which was really annoying. Further research on the Jabra forums later, it turns out the company says these are not officially supported with Bluetooth on desktop operating systems (such as Win10, MacOS) and are only intended for use with a phone (and the Jabra app) which I was really surprised with. Aside from that, they're well-made and comfy and, if using with a phone, work well. Just don't expect seamless behaviour with non-phone devices - note they did pair with Windows 10 (eventually) but it was unreliable. Hope that helps someone.