MicrosoftPaul_Huijbregts please see my comments below. I reproduced my steps for you with comments.
This wording is very perplexing: "The new unified solution package makes it easier to onboard servers by removing dependencies and installation steps.".
1) main article link
https://docs.microsoft.com/en-us/microsoft-365/security/defender-endpoint/configure-server-endpoints?view=o365-worldwide
2) says to onboard using new method, follow this link for server migration
https://docs.microsoft.com/en-us/microsoft-365/security/defender-endpoint/server-migration?view=o365-worldwide
3) make sure you're on KB5005292 but it brings you to a invalid page/search on the catalog site (I'm doing this setup as a one-off on a test server and was going to manually download the update/etc). Fiddling around, I eventually find it the intended KB on another machine.
https://www.catalog.update.microsoft.com/Search.aspx?q=KB5005292
4) on the server migration page, there's like 4 different install options depending on how you onboarded something previously. why can't it be simple. for all the resouces at your disposal, it's so manual. The section that starts with "Installer Script"
"To facilitate upgrades when Microsoft Endpoint Configuration Manager or Azure Defender are not in use or not yet available to perform the upgrade, you can use this upgrade script. It can help automate the following required steps:"
https://docs.microsoft.com/en-us/microsoft-365/security/defender-endpoint/server-migration?view=o365-worldwide
5) finally, I say F it and go directly to the onboarding page. For 2012R2 and 2016 preview, now I have to choose between a 'download installation package' or 'download onboarding package'. Which one am I supposed to use??? How do I know that my server has properly installed whatever list of pre-requisites are ...
https://securitycenter.windows.com/preferences2/onboarding
6) are ASR rules something that still needs to be manually enabled for each server onboarded? since I had to do this for each W10 endpoint onboarded ...
