Getting a warning when attempt to setup mail flow>forwarding in the O365 portal.

I am trying to set mail forwarding in the O365 portal but I got the attached warning.  I am not sure if another administrator has already setup forwarding.  

I see the ForwardingsmtpAddress  in powershell after issue the commad Get-Mailbox <mailbox>| fl name,forwardingSMTPAddress.  The strange thing is mailflow>forwarding in the portal is showing blank

Does anyone know why the portal is showing blank?  And also how it was setup?  

Thanks.