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Choose all the relevant business groups and environments. It is recommended to have 2 clients, one for NonProdFlexDeploy and one for FlexDeploy. The non-prod FlexDeploy application that you made should not have permissions to the higher environments, as it is only for testing.
Click Next.
Click Save.
Use the Copy Id and Copy Secret buttons to copy the client id and client secret which you will paste into FlexDeploy in the Integrations → Cloud section.