I changed my username and now I cannot play online

I don't understand this and I'm now worried as I have donated to a lot of servers and I don't want to lose this account. On the launcher it says my new username but when I log on it says "Account not Authenticated with minecraft.net" and "Non-Valid Username".
How can I regain the ability to use my account online?
Best Answer
It's caused by remaining logged in after changing your name. Not everything is updated.
You need to open the Minecraft launcher, log out, and log back in again (i.e. you need to enter your user and password again). This should fix it.
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Why cant I play Minecraft After I change my name?
It's caused by remaining logged in after changing your name. Not everything is updated. You need to open the Minecraft launcher, log out, and log back in again (i.e. you need to enter your user and password again). This should fix it.What happens if I change my Minecraft username?
When you change your username, your previous name is saved for 37 days. This gives you an additional week to change back if you change your mind before your previous username becomes available to anyone else.I changed my roblox user again..now I can’t get into my account..
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Images: Ketut Subiyanto, Ketut Subiyanto, Tatiana Syrikova, Mnz