cannot set a credential for pricipal 'sa'.Error Number: 15535 Severity: 16

Alter failed for Login 'sa'.
Cannot set a credential for pricipal 'sa'.
Error Number: 15535 Severity: 16 State: 1


The above error occurred when we attempted to change the sa user password using sql server management studio.

To resolve this, check the 'Map to credential' as shown in the picture and give a try.