Creating a Custom Cloud Connect Maintenance Mode Message
Last week I wrote an article on Maintenance Modes in Cloud Connect and also Veeam Availability Console. For Cloud Connect there is a default error message that get’s shown in the Job Status if any jobs are started if the Cloud Connect Maintenance Mode is turned on.documented in the online Veeam Help Centre.
To create a custom Maintenance mode notification, on the SP Veeam backup server, create the new registry value HKEY_LOCAL_MACHINE\SOFTWARE\Veeam\Veeam Backup and Replication\CloudMaintenanceModeMessage = <message> (String), where <message> is a Maintenance mode notification that you want to display on the tenant side.
Adding the key via Registry Editor is simple enough and this is what you are left with from within the Registry Editor.