I was forced to configure SNTP
cloud time should only be used to get approximate time, so that log doesn’t show year 1970
if you have access to NTP, it will always be more precise
Cloud has always worked perfectly. Now I urgently need to change fifty devices 
I do not understand why you need a service Cloud which normally does not work.
What other services are there but it is not recommended to use them ?
The cloud was created for DDNS resolution, and time sincro is a “secondary” service, but is not a NTP client/server
Use NTP client with a NTP server n1 or n2…