Sorry, there was an error : unauthorized_client Sitecore

Issue

Sometimes, after fresh instance setup maybe getting error on the login screen

Fix

1. go to C:\inetpub\wwwroot\<identityServer Instance Name>\Config\production\Sitecore.IdentityServer.Host.xml

2. update AllowedCorsOriginsGroupN values from http to https

3. AppPool recycle



Now check, hope this will work.