The Pega instances in the 8.6v of CSA is disabled, need to access to the 8.6v Pega instances to train on the 8.6v
You can raise a ticket to Pega Academy.
@ManthenaKrishnaV17315568 see answers from other questions
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Any course you are completing should be available via menu navigation from your profile.
If you are having technical issues with a Pega instance, please contact the Pega Academy support team.