"vmware backup of native key provide has failed" while backup NKP key provider

 Error:

After enabling Native Key provider (NKP) in vCenter 7.x next steps is to backup the key provider.

while select backup and provider password, we get below error:

vmware backup of native key provide has failed

Solution:

1. Make sure you connected vCenter from browser using FQDN name while doing backup.
2. Also check FQDN of the vCenter server is properly configured with connecting https://<VCIP>:5480 using root credentials.