Custom Logoffurl is not working in Office 365

I am integrating Office 365 with Identity Provider Using SAML 2.0 ,In Azure active directory navigated to Company Branding and I am trying to give custom logoff URl but there is no place to give, this option was there before in azure active directory  and I tried to give through power shell script e.g  LogOffUri = https://login.microsoftonline.com/common/oauth2/logout?post_logout_redirect_uri=http://google.co.in is not working. Please help me where and how i can give my custom LogOffUri  URI
 
Note:
1, Please find the attachment for power shall script  logoff URl  configuration
2, As mention in the below URL  azure active directory was having logoff URl  in Company Branding  which is missing in current azure active directory
https://greeneyeits.com/?p=520