Hi
FYI there is no mention of specific Cloud Extender module in your post so I can't be more specific.
If the module allows for HA mode then you need to ensure: - it is supported - it has the same software versions on all servers - and all servers have the exact same configuration.
In order to get specifics for each module you can look here:
https://www.ibm.com/docs/en/maas360?topic=guide-configuring-settings-cloud-extender-modules
Please remember that Scaling the Cloud Extender has certain requirements for server numbers etc depending on modules used, number of devices/users etc
https://www.ibm.com/docs/en/maas360?topic=guide-scaling-cloud-extender
Best
------------------------------
Eamonn O'Mahony
MaaS360 Technical Sales
Dublin
------------------------------