Save and Reuse Credentials for Discovery
As a PRTG user, I want to securely save my credentials (e.g., accounts, passwords, SNMP keys) in one place so I can easily reuse them for any discovery job.

-
Christian Fröhlich commented
The Auto Discovery function is limited to a single Active Directory domain. The DN (Distinguished Name) is reduced and does not contain any domain information.
Instead, the domain information is stored centrally in the Core & Probes area and thus applies to the entire environment.
For Auto Discovery, not only should the authorized user and OU be queried, but also the domain for this Auto Discovery. In large companies, multiple domains are often used and are not limited to individual subnets.