Unable to change HA mode for Stretched T0 Gateway once created, the UI option is grey out.
VMware NSX-T Data Center
VMware NSX
HA mode change for Stretched T0 Gateway is currently unsupported.
Workaround:
1. Unstretch the T0 Gateway a single location and the option to change the HA mode will be available.
2. Change the desire HA mode and then stretch it again to other locations.