Sometimes customers access SRX using a read-only account and want to change configuration or operate request commands. However, it was found that the command was invalid.

test@juniper-srx>  req?

No valid completions <<<<

https://www.juniper.net/documentation/us/en/software/junos/user-access/topics/topic-map/junos-os-access-privileges.html

Please check the account permission configuration or contact your administrator.