Explanation
Followers are read-only replicas of the Leader that perform asynchronous replication from the Leader. This means that they receive updates from the Leader periodically, but not in real time. Followers are designed to handle all types of read requests from workloads and applications, such as authentication, permission checks, and secret fetches. Followers can scale horizontally to support a large number of concurrent requests and reduce the load on the Leader. Followers also provide high availability and disaster recovery by serving as backup nodes in case of Leader failure or network partition. References: Set up Follower, Deploy the Conjur Follower, Follower architecture

Explanation
This is the most likely cause of this issue because it creates a discrepancy between the passwords stored in the Primary Vault and the DR Vault, which affects the Vault Conjur Synchronizer service (Synchronizer) and the application. The Synchronizer is a service that synchronizes secrets from the CyberArk Vault to the Conjur database. The application is a client that retrieves secrets from the Conjur database using the Conjur REST API. The CPM is a component that manages the lifecycle of the passwords stored in the CyberArk Vault, such as changing, verifying, and reconciling them. If the CPM is writing password changes to the Primary Vault while the Synchronizer is configured to replicate from the DR Vault, the following scenario may occur:
The CPM changes the password for an account in the Primary Vault and updates the password value in the Vault database.
The Synchronizer does not detect the password change in the DR Vault, as the DR Vault database has not been updated yet with the new password value.
The Synchronizer does not sync the new password value to the Conjur database, as it assumes that the password value in the DR Vault database is the latest and correct one.
The application requests the password value from the Conjur database and receives the old password value, which is different from the new password value in the Primary Vault database.
The application tries to use the old password value to access the target platform or device and fails, as the target platform or device expects the new password value.
This answer is based on the CyberArk Secrets Manager documentation1 and the CyberArk Secrets Manager training course2.

Explanation
Credential Providers are tools that enable applications to securely retrieve credentials from CyberArk Secrets Manager without hard-coding or storing them in files. Credential Providers can be installed on application servers or on a central server that acts as a proxy for multiple applications. Credential Providers can integrate with Privileged Cloud, which is a cloud-based solution that provides privileged access management as a service. Privileged Cloud integrates with Secrets Manager Credential Providers to manage application credentials as privileged accounts within Privileged Cloud.
When working with Credential Providers in a Privileged Cloud setting, a special consideration is that if there are installation issues, troubleshooting may need to involve the Privileged Cloud support team. This is because the installation of Credential Providers in a Privileged Cloud setting requires some additional steps and configurations that are performed by the Privileged Cloud support team. For example, the Privileged Cloud support team needs to configure the connection between Privileged Cloud and Credential Providers, and provide the necessary certificates and keys for secure communication. Therefore, if there are any problems or errors during the installation process, the Privileged Cloud support team may need to assist with the troubleshooting and resolution.
The other options are not correct. Credential Providers are supported in a Privileged Cloud setting, as described in the Secrets Manager Credential Providers integration documentation1. The AWS Cloud account number does not need to be defined in the file main appprovider.conf.<platform>.<version> found in the AppProviderConf Safe. This file is used to configure the Credential Provider settings, such as the Privileged Cloud URL, the application ID, and the SSL options. The AWS Cloud account number is not relevant for this file. Debug logging for Credential Providers deployed in a Privileged Cloud setting can be enabled or disabled by the Privileged Cloud support team, as described in the Credential Provider installation documentation2.
Debug logging can help with troubleshooting and diagnostics, but it does not necessarily exhaust available disk space, as the log files can be rotated and archived.
References = Secrets Manager Credential Providers integration; Credential Provider installation

Explanation
Conjur Summon is an open source utility that can fetch secrets from Conjur and export them as environment variables to a sub-process environment. This way, the secrets are not exposed or stored in the script, but are only available at run time. To use Conjur Summon, you need to install the summon-conjur provider on each workstation, define the secrets in a secrets.yml file, and wrap the PowerShell script in summon. For example, if the secret ID is win/domain/cred, the secrets.yml file would look like this:
DOMAIN_CRED: !var win/domain/cred
And the summon command would look like this:
summon --provider summon-conjur powershell script.ps1
This will inject the secret value of win/domain/cred as an environment variable named DOMAIN_CRED to the PowerShell script. The script can then access the secret using the $env:DOMAIN_CRED syntax.
References: Summon-inject secrets, cyberark/summon-conjur

Explanation
Secrets Provider and Secretless are two solutions that can minimize the Kubernetes application code changes required to adopt Conjur for secrets access. Secrets Provider is a Kubernetes Job or Deployment that runs as an init container or application container alongside the application pod. It retrieves secrets from Conjur and writes them to one or more files in a shared, mounted volume. The application can then consume the secrets from the files without any code changes, as reading local files is a common and platform-agnostic method. Secretless is a sidecar proxy that runs as a separate container in the same pod as the application. It intercepts the application's requests to protected resources, such as databases or web services, and injects the secrets from Conjur into the requests. The application does not need to handle any secrets in its code, as Secretless handles the authentication and authorization for it. References: CyberArk Secrets Provider for Kubernetes, Secretless Broker