Have you seen this kb?
SMHV does not delete older version backups from the UI:
https://kb.netapp.com/Advice_and_Troubleshooting/Data_Protection_and_Security/SnapManager_Suite/SMHV_does_not_delete_older_version_backups_from_the_UI
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Re: Cannot manually delete backups in the SMHV console? Server 2022 failover cluster with CSV.
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