First make sure your client secret has not expired.
If your client secret was just created then don't use it right away, it will take effect with some delay. You can wait 1 minute and try again or run the request a few more times.
If the above suggestions do not resolve the issue, you can try creating a new client secret instead.
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Hello @Parshva Doshi ,
Did you refer to Carl's answer above? Is it helpful to you? Comment here when you still need any help.