Message SAP WSS030 - No unique mapping for SAML authentication found (Issuer &3)

Diagnosis
No unique mapping for SAML authentication found (Issuer &V3&)

System Response
Authentication failed

Procedure
Please ensure the mapping is unique. You may check the mappings intransaction SM30, view VUSREXTID, type SA. For more information onmapping check the documentation and note 1254821.
SAML Issuer: &V3&
Certificate DN: &V1&&V2&
If you use report RSUSREXTID for maintaing the mapping, the followinginformation if usefull:
Type of External ID:SA
Prefix of External Name: &V4&
Name of Issuer: &V1&&V2&