Based on the way you've asked this question, I assume you are using the FlexNet Manager Suite Cloud UI (which is soon to be retired and replaced with the Flexera One UI).
A bearer token can be obtained by going to Accounts > All Accounts > Create an account > Service account in the web UI. Add a new account, and the token will be displayed once when the account is created. Be sure to remember the token, as once you navigate away from the page it is impossible to retrieve the token. If you forget the token you need to create a new service account to get another token.
With that said, I'm not fully sure that this is the type of token you are looking for. Can you clarify what API you are using? That may help to confirm whether the info I've given here is relevant for your scenario.
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