\uD83E\uDD14 Problem
Clicking the Secure Macro will throw an error, and it does not allow the decryption of secrets.
It is not possible to edit the Macro itself when editing the page.
\uD83C\uDF31 Solution
The problem is caused by the PGP Encryption Key is no longer match with the affected Secure Macros. As the PGP Encryption Key is a unique key on every Confluence instance, the above will happen when:
The Confluence instance is migrated from another server.
The Secure Macro is copied from another Confluence instance.
Follow the article below to fix the issue: