Just bought 24. where is my licence number and auth code

just bought 24. where is my licence number and auth code

There is no license number and authorization code. You sign into SketchUp using the email address and password you used when you purchased the subscription. See:
https://help.sketchup.com/en/sketchup/getting-started-sketchup

Please update and complete your forum profile. It says you’re using SketchUp 2018.

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