Just chiming in that as of 11:00 AM EDT in Florida, I still cannot get mine, my sisters, or either of my two friends OBi202's to connect. Many other people have said they got it working by manually setting DNS but that has not worked for me, nor has many hours of tinkering including resetting everything and starting over from scratch. I have a spare OBi202 and can't get it working either.
My DNS entries were already set to 1.1.1.1 (CloudFlare) and 8.8.8.8 (Google) but I went ahead and reversed the order and put the Google DNS first. Static IP, Gateway, Mask are all correctly set as well.
I did notice a couple of things no-one else has mentioned though. First, when you try to reconnect the OBi to Google, the Terms-of-Service you are supposed to agree to comes up blank. The 'Accept' button is there though, and apparently works for you to accept the invisible terms.
Second, I tried deleting/resetting everything as mentioned, including deleting the OBi device from my list of GV devices. After going thru the whole setup process over again from scratch, it has NOT re-added my OBi device to my GV device list, and I see no way to add it from the GV settings page.
And for what its worth, my ISP is AT&T fiber (but not using their DNS). I guess none of this is relevant though if the
obihai.sip.google.com address won't resolve. Mostly I think I just wanted to vent 🤬 that it still is not working here. The other people I mentioned bought OBi devices upon my recommendation so this is making me look bad!