I froze 3 kanji schedules yesterday, went to unfreeze them this morning, got the usual green banner saying it might take a couple of minutes, but the schedules didn't unfreeze. I tried it several times throughout the day, but it's now been 10 hours and still nothing.
I have this exact same issue, having tried to unfreeze a vocab schedule several times today on both mobile (iOS app) and web (macOS, Vivaldi browser) with no success, but also seeing the usual green banner about taking a few minutes.