After installing the sitecore 9.1 I tried to configured unicorn 4.0.6 . Everything was fine except on my in sitecore 9.1 instance while I tried to write http://<website domain>/unicorn.aspx,
it redirected to the Access Denied "You need to Sign in as an administrator to use Unicorn control panel".
While click on the above message sitecore is navigate to identity server url . After logging in, I am taken to the Sitecore Dashboard and not back to /unicorn.aspx.
For that result unicorn.aspx serialization page is not showing .