Possibly let us know what the role name is and what you confirmation rules are. What SP are you on for GRC?
Consider if you have enforced adherence to naming convention and it does not match. Also, is the role a valid name to use in the customer name space (e.g. you haven called it SAP_XXXX*) - possibly try creating role directly in SAP system to test?
Also, SAP put out knowledge based article 1685431 - Error: Role name is Invalid <>.Valid name: <>
It's pretty much saying check your config