PSE-file for SAFT-PT application not available for client &1 in system &2

What causes this issue?

The system runs a cloud service that requests the SAFTPT Secure Storage
and Forward (SSF) - application to sign a document with a Portuguese
digital signature.
The SAFTPT SSF-application is currently not configured to generate this
signature in this specific system.

System Response

To sign documents with a Portuguese digital signature, the SAFTPT
SSF-application requires a system that contains a
specifically-configured and certified PSE-file.
It is a legal requirement that the SAFTPT SSF-application must generate
a digital signature.

How to fix this error?

The Secure Storage and Forward (SSF) environment of the dedicated cloud
system must be correctly setup. This setup change must be completed by
the provider of the cloud service you use.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.