AUTH_6.0 - 401 Unauthorized

Hello community,
I'm trying to access

/API/v3/surveys

. However, I got 401 Unauthorized error as below. Can anyone advise me what is the exact issue?
Thank you.
Screen Shot 2022-04-04 at 11.27.30 PM.png

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Finally, I found the problem. The problem is that single quote on

Authorization

Header. For example: Bearer ''.

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