There are ways around this. For many commands there is no issue with adding commands that already exist. However for things like a VTY ACL you may get kicked out. To avoid this you can do something like the following:
line vty 0 15
no access-group SSH
no ip access-list standard SSH
ip access-list standard SSH
permit host 184.108.40.206
line vty 0 15
You can do similar things for other issues that DNAC has an issue with. DNAC does not like if NTP is already there and will fail when you push the template if it already exists. For that simply remove ntp and then add the commands back similar to the ACL example above.
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