I have a MacBook Pro 13" late 2013 Retina with 10.10.1 and an iPhone 5s. Since upgrading to Yosemite, I cannot use my iPhone as a hotspot. Before Yosemite, I would select it as a WiFi option. Now with Instant Hotspot it shows up under the same menu but under its own section. I am signed into both my Mac and iPhone with the same iCloud account. I have tried signing out of both and back in. No matter what I can't connect. It tries connecting and then I get a message a minute later saying "Failed to enable Hotspot." I can still connect to my iPhone's hotspot via my ChromeBook, however. I believe this is an iCloud issue. Instant Hotspot supposedly makes it easier to connect to your iPhone by letting you bypass turning on Personal Hotspot and entering a WiFi passcode. However, since I can't get Instant Hotspot to work, I'd rather just use it the way it was--Personal Hotspot, but that does not show up. Any advice?