https://www.googlenestcommunity.com/t5/Smart-Home-Developer-Forum/refresh-token-error/m-p/616091#M6989 <P>Hello&nbsp;<a href="https://www.googlenestcommunity.com/t5/user/viewprofilepage/user-id/423982">@tianchengz</a>&nbsp;,</P> <P>The reason HTTP 400 Bad Request error with the body text {"error": "invalid_grant"} is being returned could be attributed to the fact that there could be a possible mismatch in any one of the following parameters, "<SPAN>client_id" or "client_secret" or "authorization code" or "redirect_uri". You can solve this issue by asking the user to carry out the re-link process from scratch.&nbsp;</SPAN></P> <P><SPAN>More information in this regard can be found <A href="https://developers.home.google.com/cloud-to-cloud/project/authorization#exchange_authorization_codes_for_access_tokens_and_refresh_tokens" target="_self">here</A>.&nbsp;</SPAN></P> <P>&nbsp;</P> Thu, 25 Apr 2024 23:17:31 GMT sipriyadarshi 2024-04-25T23:17:31Z https://www.googlenestcommunity.com/t5/Smart-Home-Developer-Forum/refresh-token-error/m-p/615904#M6986 <P>When Google sent a refresh_token request, I returned an HTTP 400 Bad Request error with the body text {"error": "invalid_grant"}, which caused the problem of all user devices being offline. Can I take any remedial measures for this situation? Or it can be re linked by the user!</P> Thu, 25 Apr 2024 02:02:08 GMT https://www.googlenestcommunity.com/t5/Smart-Home-Developer-Forum/refresh-token-error/m-p/615904#M6986 tianchengz 2024-04-25T02:02:08Z https://www.googlenestcommunity.com/t5/Smart-Home-Developer-Forum/refresh-token-error/m-p/616091#M6989 <P>Hello&nbsp;<a href="https://www.googlenestcommunity.com/t5/user/viewprofilepage/user-id/423982">@tianchengz</a>&nbsp;,</P> <P>The reason HTTP 400 Bad Request error with the body text {"error": "invalid_grant"} is being returned could be attributed to the fact that there could be a possible mismatch in any one of the following parameters, "<SPAN>client_id" or "client_secret" or "authorization code" or "redirect_uri". You can solve this issue by asking the user to carry out the re-link process from scratch.&nbsp;</SPAN></P> <P><SPAN>More information in this regard can be found <A href="https://developers.home.google.com/cloud-to-cloud/project/authorization#exchange_authorization_codes_for_access_tokens_and_refresh_tokens" target="_self">here</A>.&nbsp;</SPAN></P> <P>&nbsp;</P> Thu, 25 Apr 2024 23:17:31 GMT https://www.googlenestcommunity.com/t5/Smart-Home-Developer-Forum/refresh-token-error/m-p/616091#M6989 sipriyadarshi 2024-04-25T23:17:31Z