Open Logon Page in Browser not working

Tutorials: https://developers.sap.com/tutorials/abap-environment-trial-onboarding.html
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when I get to step (Open Logon Page in Browser) I get the error as below.

You were successfully authenticated, but an error occurred during the Service Instance logon. Please ensure that you have a user for the Service Instance.

Please guide me how to fix

even though i have successfully logged in

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