When you're launching your deployment to cloud, the system requires you put AD DNS Name. The field is required to name the domain that will be created for your deployment. Every deployment is created with a separate local DNS.
AD DNS Name field requierements:
Name example: dnsname.local
Maximum number of characters:
- with 1 dot (name1.end1): from 1 to 14 letters or numbers in front and 1 to 14 letter or numbers after the dot
- with 2 dots (name1.name2.end1): from 1 to 14 letters or numbers before the first dot, from 1 to 14 letters or numbers after the first dot and from 1 to 5 letters or numbers after the second dot