External Alarm Write to a variable in Safety Application

I am getting the message “Write failed: The Data Access Write operation was rejected because the Authentication Manager is not available”.
Tried to write the variable "vProcessAudible" . Please see the access right configuration of the variable attached.
Configuration is working fine , if the application is Non-SIL.

Already tried below seetings:

SIL access to - Read-only and confirm.

Write permission to Administrate, Operate and Approve in Property permission.

Any suggestions.