Automatic Updates is not working

Hi,

Somehow Automatic Updates is not working on our racks.
I am sure “Automatic Updates” is hourly seen on Rack Setting in convox console.

As far as I remember, while I was testing to see how whole convox works in us-east-1 region or other us reginos, Automatic Updates were surely working. But now it are not working and stuck with the version 20190304140515.

Do you have any advice to let it work as expected?

Thanks in advance.