can log into Minecraft at home (on Mac) but not recognised on on PC elsewhere..?

My son logs into Minecraft on our computer (Mac) but since he joined the Minecraft club at school he cannot log in there. We know the login details are correct but he gets the message that they are unrecognised or the referenced account cannot be logged on to. Other people are using Minecraft there so its not a firewall issue. Any ideas? Thank you

Solution 1:

From my experience, Minecraft login is really buggy. This stuff happens ALL THE TIME. Sometimes, it is because of what you're logging in with. If your son has had Minecraft for a short amount of time, then you need to log in with your username. If he's had it for a while, try logging in with the email. For more details about which to use, visit the Mojang website

Other than that, maybe you tried with failed attempts too many times. Like your phone will lock you out, maybe Mojang does the same thing-ish? I don't really know at this point.

Just remember, Minecraft login does this. Just stay calm. And if all else fails, Mojang.com or Minecraft Wiki.