I did the Hue bridge integration setup some time ago and it successfully found all my bulbs and groups.
Now I have added some more groups, but it does not seem to be able to find them. When I go into Find groups it just says there is no groups not added. Clicking "Refresh Group Discovery" does not seem to do anything.
BTW: The reason I want to use groups and not just the bulbs directly is that Hubitat can control a group, but unfortunately does not understand the Hue Plugs yet.
Is the group you are trying to add only comprised of plugs? I would suspect that group would be different than groups of hue bulbs and therefore might not be able to sync across. If you add a hue bulb to one of your "not-found" groups is Hubitat able to find it then?
Also, you are syncing normal bulbs too, right? There's a minor bug that you have to sync at least one regular bulb and not just groups.
Renaming Hue groups won't update the Hubitat name--that's set when the integration app creates the device and won't change unless you do so manually. I'm not sure how Hue groups with only plugs or a mix of bulbs and plugs show up or if Hubitat's integration looks for lights and then shows only those groups.
I don't want to plug my own app here, but I recently released an open-source Hue Bridge integration [RELEASE] CoCoHue: Hue Bridge Integration (including scenes!), and I know it doesn't don't do anything special to filter out plugs if it just gets presented by the API as a regular device ("light") or group. Hubitat has barely updated their integration since it was released, and while they may decide to add in this feature if theirs needs to explicitly whitelist certain categories of devices, I can say that I'd be willing to work with you if mine doesn't work, but I assume it already should.
I don’t see anyone identifying this as a bug. The op just said it didn’t work for him. Why are you identifying it as a bug? Do you have data to share? I see no logs presented for a developer to review.