My Minecraft does not work on Mac It always comes the message Make sure you're online…
It's best to wait another day or restart your Mac again. Maybe your internet is broken. I also have a Mac. Sometimes that does not work for me.
It works already for a few days have not restarted the mac
It's best to call Mojang Support.
Is your MAC connected to the internet (so you can google or something)?
Is any firewall blocking the connection?
Can you post the contents of the launcher.log file? (absolutely delete all private information!) On Girlfriend, unfortunately, it is not readily possible to delete a post)
What kind of AVP do you have?