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I am trying to create a new package version using 2GP.

When I run this command

sfdx force:package:version:create ...

I am getting this error:

ERROR running force:package:version:create: Can’t create package version. Removing metadata components from a second-generation managed package is a pilot feature that requires acceptance into a pilot program.

At the time of posting, the Partner Community support section is broken, so I cannot raise a case.

Based on the error message, it obviously thinks I've deleted something, is there a command I can run to figure out what the deleted metadata is?

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  • 1
    don't you version control your metadata? Feb 9 '21 at 17:26
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    I do. But my git install got corrupt, so there was a 3 month period when I didn't commit any changes... 🤦🏼‍♂️
    – Robs
    Feb 9 '21 at 17:44
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EDIT: The bug has been fixed and the error message now contains the metadata components that you are trying to delete

Original answer:

There is no way to see the root cause of the error without opening a Case

They have created a Known Issue about this -- that is, the error message should identify the metadata you're attempting to delete:

https://trailblazer.salesforce.com/issues_view?id=a1p4V000001nTzbQAE

Additionally, in our case, the problem was due to Profiles in package directories OUTSIDE of the package directory that I was trying to package. Apparently the 2GP packaging process pays attention to Profiles in ALL of the directories listed in the packageDirectories array in sfdx-project.json when computing the metadata payload to send up for packaging. If you delete a Profile from one of these directories, you get the error documented by the OP

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  • does this require premier support?
    – Patlatus
    May 20 '21 at 13:50
  • Yes, to get to the root cause of the error above, we had to use Premier Support. However, the bug has been fixed now for about 2 months and you will now get an error message that enumerates the list of components that you're trying to delete when building the package version
    – daveespo
    May 20 '21 at 18:02

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