Most of time during the VXLAN configuration, we have an error message "Cannot complete the operation see the event log for details"
Actually, you won’t see anything in the log files. I recommend you to look ESXI host’s logs.
You can use tail -f to see what’s going on when you try to install the VIB file.
I recommend you to check DNS settings on all ESXI host and enable Http client firewall on each ESXI host