If you add "Bearer", use what @Srini007 suggested literally - replace "_AuthorizedToken" with "Authorization" like this:
Authorization: Bearer %AccessToken%
Also, try experimenting with the different options under the Advanced settings of the Invoke web service action:
- Try enabling or disabling the "Encode request body" option
- Try enabling or disabling the "Accept untrusted certificates" option
- Try enabling or disabling the "Follow redirection" option
These are the usual culprits for an API call not working in PAD initially.
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