Troubleshooting Tip: The IPsec VPN tunnel not coming up, with debug message 'ignoring IKE request, interface is administratively down'

The debug error message is referring to the actual IPSEC tunnel interface, not the physical interface.
Changing the status to 'Enabled' or 'Up'  will fix the issue.

To check the status of the IPSEC tunnel interface.

From GUI:

From CLI:

For this particular issue, It is more likely that the changes were done administratively.

It is possible to confirm when the changes were made, or who made the changes under the System Event Logs.