Need to return my username

Hello, my UserName was fcc91519965-099a-483f-bf11-cc6e0b9624c1, then i change it to ZherdevMaxim, but now I need to return my first nickname becouse my organisation treck my account and can,t change link. When i tried to rename my account to fcc91519965-099a-483f-bf11-cc6e0b9624c1 again ‘Username not available’ message appeared. Can you haelp my to change my username to fcc91519965-099a-483f-bf11-cc6e0b9624c1 ??? thanks

you may need to reach out to support@freecodecamp.org