Why are all the Enterprise Cert experation date are N/A

[rpbarham]

I am checking the vManager WAN Edge list  and all the Enterprise Cert expiration date are N/A. Can anyone explain why they are. Everything is working without issues, but I am concern why the status is like that, and I cannot find any documents that explain why. I would appreciate some help on this.

Thanks.

[MHM Cisco World]

https://www.cisco.com/c/en/us/support/docs/routers/sd-wan/220448-identify-vedge-certificate-expired-on-ma.html <<- cert expire effect CC, the data traffic not effect until you prefix need to refresh after that you will face issue 

MHM