After Oracle databases migrated to different versions, the following errors occur from a couple of RMAN backups, which have been working find in old version databases.
It happens for some Oracle databases applied the latest RU/RUR/BP, etc.
... .. . RMAN-03002: failure of crosscheck command at 08/04/2021 13:51:11 RMAN-06091: no channel allocated for maintenance (of an appropriate type)
CAUSE & WORKAROUND
It is a known bug for all database versions until 19c.
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