This may be because Helm filters out pre-releases by default when searching for the chart to install. If the channel only contains prerelease charts, then you will also need to pass the --version flag to Helm. You can pass the exact chart version to this flag if it’s known and Helm will install it. However, if you would like to just install the latest version, you can pass --devel or --version '>0.0.0-0', which will cause Helm to include all releases (including prereleases) in its search.
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