I had a recent similar situation. I like to use the Engage app at https://engage.hivechain.app/ but kept getting red "nope" notifications. I checked and double checked the time, time zone, date. It seemed correct to me. I'd manually changed the date/time (because I'd had troubled with the auto sync), but I decided to auto sync. Boom, fixed again. So, the take-away to me is: the time, time zone, and date are crucial; they must be correct to correctly interact with the Hive blockchain (and likely many other platforms).