[dudul]

I don't have an answer, but it always surprised me what people would say either in Direct Messages or in private channel. This is a corporate slack, I'm pretty sure management can access all conversations, even in DM or private channels.

[chipperyman573]

You can't directly access DMs, but if you pay slack enough to export data for data compliance (I think it's the most expensive tier but it may be a lower one, but definitely not the free one), DMs are exported in that file, so you can indirectly get access to DMs that way.

[ziddoap]

I know, at least at our tier, I cannot access private messages.

[ereyes01]

Even if weren't possible now, it may be possible in the future because Slack (in practice) owns and controls that data without any oversight from you. Anything you say might be deleted after a while, or might be held indefinitely.

[ziddoap]

Well... Yeah. I didn't intend to imply that it will never be a feature (it might already be in higher tiers), and I never intended to imply anything about Slack's data retention.

I was just stating that at the moment, at my tier, I am unable to see private messages.

[GauntletWizard]

Your employer can always change your password and then login as you to read your private messages. It leaves behind a trace (you've gotta reset your password afterwards, they can't restore your old one), but it's a "workaround".