OBTU tool gives the following error, "SDDC_MANAGER_FQDN_NOT_VALID"
SDDC Manager precheck returns the following error(s),Error message shows 'NSX hostname is not a FQDN', 'vCenter hostname is not a FQDN', 'ESXi hostname is not a FQDN'
VMware Cloud Foundation 5.x
The SDDC Manager precheck errors can be safely ignored and is fixed in the 5.2.1 release of SDDC Manager.
For the OBTU error, please use the latest version of the tool 5.2.1