NuGet "NU1102: Unable to find package with version" in CI

Unlike NU1101, the package id was found - but no published version satisfies the requested range. NU1102 lists how many versions exist and the nearest one, which tells you whether you pinned a version that was never published or one the feed has not mirrored yet.

What this error means

Restore fails with NU1102 showing the requested range and a "Found N version(s)" line with the nearest available version. It is deterministic for a given feed state.

error NU1102: Unable to find package Polly with version (>= 9.9.9)
  - Found 42 version(s) in nuget.org [ Nearest version: 8.4.1 ]

Common causes

A version was pinned that does not exist

A typo in the version, or a version that was yanked/never published, leaves no candidate in the requested range.

The private feed has not mirrored the version

A pull-through or upstream feed has not yet ingested the newest version, so CI sees an older set than a developer machine pointed at the public feed.

How to fix it

Pin a version that is actually published

1. Read the "Nearest version" hint in the error to see what the feed has.
2. Update the PackageReference Version to a published value.
3. Re-run restore to confirm resolution.

<PackageReference Include="Polly" Version="8.4.1" />

Refresh the upstream/pull-through feed

1. If using a mirror, trigger or wait for it to ingest the requested version from upstream.
2. Confirm the version now appears in the feed UI.
3. Re-run the build.

How to prevent it

• Pin only versions you have confirmed exist on the CI feed, not just locally.
• Use a lock file so version resolution is reproducible across machines.
• Watch for upstream ingestion lag when relying on a mirror feed.

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