‘See if your Mac can run macOS Monterey’ available here https://www.apple.com/macos/monterey-preview/
Jtasoftware
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I filled a radar: FB11420810
PS : to be noticed that the same Identities are fine when used to sign or encrypt with Apple Mail. So either Apple Mail uses another API either it works for those identities with CMSEncode/Decode in some way…