Hello,
I had updated to Sierra about 2 weeks ago, and everything was going fine. However, about 2 days ago, I had been receiving errors when I try to send messages from my Mac.. It says that when I try to log back in, that an error had occurred during authentication. I've tried restarting, logging out and logging back in, pretty much everything I could think of (I spent an hour and a half today on the phone with Tech Support and they couldn't help). Any suggestions? My iCloud is logged in on my MacBook, internet works fine, iMessage works on my iPhone 6s. Really confused about this.
On Macs using macOS Sierra and earlier, your computer by default stores all your iMessages on your hard drive. And for new versions like macOS High Sierra and above, unless you sync with iCloud using Messages in iCloud, your Mac likely saves your messages too. To check, open your Message App and choose Messages Preferences from the top menu. This site contains user submitted content, comments and opinions and is for informational purposes only. Apple may provide or recommend responses as a possible solution based on the information provided; every potential issue may involve several factors not detailed in the conversations captured in an electronic forum and Apple can therefore provide no guarantee as to the. IMessage is Apple’s own instant messaging service that sends messages over the Internet, using your data. You must have an Internet connection to use the service. To send iMessages, you need a data plan, or you can send them over WiFi. The Messages App on your Mac allows you to receive and send unlimited iMessages to anyone using an Apple device. Additionally, the Messages App on your Mac can also be setup to send and receive carrier supported SMS Text Messages to those who are not using Apple devices.
MacBook Pro
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