Error code returned when obtaining Weibo Oauth access token: 21323. What is the reason? Does it have anything to do with my failure to complete developer authentication?

I tried to get access token, but returned error code 21323. What is the reason?
the error description is: the request is illegal. I guess it has something to do with the fact that I haven"t authenticated the developer of Weibo yet?
if this is the reason, is there any way to get around this limitation?
Thank you

Api
Mar.20,2021

21323: illegal request is mostly due to incorrect parameters of your request, most likely due to redirect_uri coding error

Please request strictly according to the api in the development document

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