What are the status of:
1. NSX Host Preparation/Installation Status
2. VXLAN Transport Configuration Status
Could you share some screenshots?
Are the NSX VIBs still there?
SSH in to the ESXi host and check with a command: esxcli software vib list
NSX VIB names are:
esx-dvfilter-switch-security
esx-vsip
esx-vxlan
Does the VTEP vmkernel still exist in the ESXi host?
If for example you have added ESXi host that previously prepared for NSX, the un-prepare/uninstall process may not complete successfully and you would need to manually remove the VTEP vmkernels