Getting error while register the FortiManager

Hi @Shantilal1998 

You will need to switch between accounts when login on the portal and try to register it with different account or try to login with admin account on portal , if assistance needed please call our customer support .

https://docs.fortinet.com/document/fortimanager/6.4.0/new-features/863385/prompt-admin-to-register-fortimanager-with-forticloud