카카오 로그인 REST API 400 에러

org.springframework.web.reactive.function.client.WebClientResponseException$BadRequest: 400 Bad Request from POST https://kauth.kakao.com/oauth/token
at org.springframework.web.reactive.function.client.WebClientResponseException.create(WebClientResponseException.java:308) ~[spring-webflux-6.0.11.jar:6.0.11]
Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException:
Error has been observed at the following site(s):
*__checkpoint ⇢ 400 BAD_REQUEST from POST https://kauth.kakao.com/oauth/token [DefaultWebClient]

https://kauth.kakao.com/oauth/token 들어가면
{“error”:“invalid_client”,“error_description”:“Bad client credentials”,“error_code”:“KOE010”}라고 뜹니다. 답답합니다…

ID : 1054000

아래 내용 참고해주세요.

KOE010 (Bad client credentials) 에러가 발생할 때