Update troubleshoot-linux-rhui-certificate-issues.md

Added steps for installing RHUI base-ha client to upgrade RHEL-HA offer images to RHEL 8.10 version. These steps were shared by PG team through ICM: https://portal.microsofticm.com/imp/v5/incidents/details/577694774/summary
These are tested and worked fine with upgrade.

Author: vkchilak

support/azure/virtual-machines/linux/troubleshoot-linux-rhui-certificate-issues.md

@@ -455,7 +455,7 @@ The following steps apply if the OS version is *earlier than the latest version
    sudo echo $(. /etc/os-release && echo $VERSION_ID) > /etc/dnf/vars/releasever
    ```
 
-3. Verify that the corresponding repositories are available and show no errors. To do this, run the `yum repolist` command:
+3. Verify that the corresponding repositories are available and show no errors. To do this, run the `dnf repolist` command:
 
    ```bash
    sudo dnf repolist all
@@ -477,7 +477,7 @@ The following steps apply if the OS version is *RHEL 8.10* supported by SAP and
    sudo dnf --config='https://rhelimage.blob.core.windows.net/repositories/rhui-microsoft-azure-rhel8-base-sapapps.config' install rhui-azure-rhel8-base-sap-apps
    ```
    
-3. Verify that the corresponding repositories are available and show no errors. To do this, run the `yum repolist` command:
+3. Verify that the corresponding repositories are available and show no errors. To do this, run the `dnf repolist` command:
 
    ```bash
    sudo dnf repolist all
@@ -499,7 +499,7 @@ The following steps apply if the OS version is *earlier than the latest version
    sudo echo $(. /etc/os-release && echo $VERSION_ID) > /etc/dnf/vars/releasever
    ```
 
-3. Verify that the corresponding repositories are available and show no errors. To do this, run the `yum repolist` command:
+3. Verify that the corresponding repositories are available and show no errors. To do this, run the `dnf repolist` command:
 
    ```bash
    sudo dnf repolist all
@@ -521,10 +521,10 @@ The following steps apply if the OS version is *RHEL 8.10* and the VM was create
    sudo dnf --config='https://rhelimage.blob.core.windows.net/repositories/rhui-microsoft-azure-rhel8-base-sap-ha.config' install rhui-azure-rhel8-base-sap-ha
    ```
 
-4. Verify that the corresponding repositories are available and show no errors. To do this, run the `yum repolist` command:
+4. Verify that the corresponding repositories are available and show no errors. To do this, run the `dnf repolist` command:
 
    ```bash
-   sudo yum repolist all
+   sudo dnf repolist all
    ```
    
 
@@ -542,12 +542,38 @@ The following steps apply if the OS version is *RHEL 8.10* and the VM was create
    sudo echo $(. /etc/os-release && echo $VERSION_ID) > /etc/dnf/vars/releasever
    ```
 
-3. Verify that the corresponding repositories are available and show no errors. To do this, run the `yum repolist` command:
+3. Verify that the corresponding repositories are available and show no errors. To do this, run the `dnf repolist` command:
 
    ```bash
    sudo dnf repolist all
    ```
+  
 
+#### [RHEL 8.10 - RHEL-HA (E4S)](#tab/rhe810-rhel-base-ha)
+
+1. Remove the releasever file if it exists.
+
+   ```bash
+   sudo rm /etc/yum/vars/releasever
+   ```
+   
+2. Remove the client `rhui-azure-rhel8-ha` package by running the 'dnf remove' command:
+
+   ```bash
+   sudo dnf remove rhui-azure-rhel8-ha
+   ```
+   
+3. Install the `rhui-azure-rhel8-base-ha` package by running the [dnf](https://dnf.readthedocs.io/en/latest/command_ref.html) installation command:
+
+   ```bash
+   sudo dnf --config='https://rhelimage.blob.core.windows.net/repositories/rhui-microsoft-azure-rhel8-base-ha.config' install rhui-azure-rhel8-base-ha
+   ```
+
+4. Verify that the corresponding repositories are available and show no errors. To do this, run the `dnf repolist` command:
+
+   ```bash
+   sudo dnf repolist all
+   ```
 ---
 
 > [!NOTE]