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it has always worked for any other system behind a Lan but for these ones, seems like either one can register and be seen on the inventory page. If I try to register one, the other one doesn't show up anymore on the Inventory page.

I'm using the same credentials for both and one is installed as RPM and the other one as ImageMode generated on this RPM machine.

For some weird reasons in the Inventory the RPM machine shows up as Bootc booted (which is clearly not true). Bear in mind the RPM machine (screenshot from Inventory attached) is also running Microshift (installed as RPM).

Edit (2025/11/20): After the initial investigation we found out that all of these systems have the same subscription_manager_id. Even after re-registration via subscription-manager, it assigns a new RHSM ID, but the same one, to all of these systems. Insights/Lightspeed Inventory then receives multiple payloads with the same RHSM ID, which makes it think that they all come from the same system. This indicates a bug on the RHSM side, as the RHSM IDs should be unique for each system. See this comment for examples: https://issues.redhat.com/browse/RHINENG-21828?focusedId=28509078&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-28509078