'An error occurred when signing in with the selected credentials:
A credential with the specified alias "ABRD:......." could not be found in the specified keystore. Please check the details in PLS setup, and try again'.
This error indicates that you have not set up the required Machine Credentials for the assigned Tax agent to lodge this return.
Check the below:
The Tax agent number assigned is correct.
Machine credentials for the Tax agent assigned have been set up in PLS Response and are valid.