“Invalid_client” error in Discord

If you set the OAuth authentication of Discord, you will get “Invalid_client” in the test connection. The error log is as follows. What should I do?

[2023-09-20 04:48:54 UTC] : OAuth plugin catched the flow, $_REQUEST array=>
[2023-09-20 04:48:54 UTC] : Array
(
[code] => xxxxxxxxxxxxxxx
)

[2023-09-20 04:48:54 UTC] : Authorization Response Received
[2023-09-20 04:48:54 UTC] : OAuth Flow
[2023-09-20 04:48:54 UTC] : Token request content =>
[2023-09-20 04:48:54 UTC] : Token Request Sent => https://discordapp.com/api/oauth2/token
[2023-09-20 04:48:54 UTC] : body =>
[2023-09-20 04:48:54 UTC] : Array
(
[grant_type] => authorization_code
[code] => xxxxxxxxxxxxxxx
[redirect_uri] => xxxxxxxxxxxxxxx
)

[2023-09-20 04:48:54 UTC] : headers =>
[2023-09-20 04:48:54 UTC] : Array
(
[Accept] => application/json
[charset] => UTF - 8
[Authorization] => Basic xxxxxxxxxxxxxxx
[Content-Type] => application/x-www-form-urlencoded
)

[2023-09-20 04:48:54 UTC] : Token Response Received => {"error": "invalid_client"}
[2023-09-20 04:48:54 UTC] : Token Response Received => ERROR : invalid_client