@FabioLima1 We definitely need more info here to be able to help you out better. When you indicate SIEM team told you volume of logs is low, Im not sure how to "digest" that info. Are they expecting to see certain amount of logs per minute/hour/day? Whatever you see as far as amount of logs on whatever log server it is, thats what should show up on SIEM side.
We use SIEM for few customers and so far, no issues as far as logs being received from the config we did in Smart-1 cloud environment.
Again, maybe doing some basic packet captures may help.
Andy