Fix error code descriptions in troubleshooting guide

Author: fnedjadi

support/power-platform/power-automate/desktop-flows/troubleshoot-errors-running-attended-or-unattended-desktop-flows.md

@@ -46,7 +46,7 @@ _Original KB number:_   4555406
 |ConnectionNotEstablished|404|Attended</br>Unattended|The endpoint wasn't found. None of the connected listeners accepted the connection within the allowed timeout.</br> This error code can be caused by routing or firewall configuration issues. Check that your machine is online and can communicate with the required Power Automate endpoints.|
 |DnsError|404|Attended</br>Unattended|The endpoint wasn't found.</br> Register your machine again and schedule new runs.|
 |ConnectionTimeout|404|Attended</br>Unattended|This request operation didn't receive a reply within the configured timeout.</br> Check that your machine is online and can communicate with the required Power Automate endpoints.|
-|MachineNotFound|404|Attended</br>Unattended|The machine was not found.</br> Please check the machine registration/connections and try again.|
+|EndpointDoNotExist|404|Attended</br>Unattended|The endpoint wasn't found.</br>Register your machine again and schedule new runs.|
 |GroupIsEmpty|400|Attended</br>Unattended|The machine group is empty.</br> Add machines to the group, then reschedule new runs.|
 |MSEntraMachineAlwaysPromptingForPassword|400|Unattended|For more information about this error code, see [An unattended desktop flow run fails with the MSEntraMachineAlwaysPromptingForPassword error](msentramachinealwayspromptingforpassword-error.md).|
 |NoCandidateMachine|400|Attended</br>Unattended|The run has exceeded the queue waiting time limit.</br> Consider allocating more machines or spreading desktop flow runs to optimize wait time in the queue.|
@@ -66,3 +66,4 @@ _Original KB number:_ &nbsp; 4555406
 |AccountLockedOut|400|Unattended|This error occurs when an internal system policy has prevented an account from creating a session on the machine because of too many sign-in attempts or password change attempts for the account. It's related to an on-premises configuration, not Power Automate licenses. Check that password rotation policies don't interfere with your scheduled runs, causing many incorrect sign-in attempts. If this error occurs regularly, work with your IT administrator to review sign-in attempt logs and account lockout policies.|
 |LogonTypeNotGranted|400|Unattended|For more information, see [troubleshooting documentation for logon type not granted](logon-type-has-not-been-granted.md).|
 |UnallowedTenantForConnectWithSignIn|403|Attended|This error occurs when using a [connect with sign-in](/power-automate/desktop-flows/desktop-flow-connections#connect-with-sign-in-for-attended-runs) connection on an Active Directory (AD) domain-joined machine without adding your tenant to the allowlist. </br> For more information, see ["UnallowedTenantForConnectWithSignIn" error in a Power Automate desktop flow](troubleshoot-unallowed-tenant-for-connect-with-sign-in.md).|
+|MachineNotFound|404|Attended</br>Unattended|This error occurs when the machine was unregistered durring a run or if the CDS organization has been migrated to a different region or to/from FirstRelease scale group.</br> Please check the machine registration/connections and try again.|