Slack has announcement channels. These are channels that spread across workspaces in an enterprise grid. Accounts that can post to such channels are restricted. Others are read-only. When I get a notification that something has been posted in this channel, I can click "Go" to go to this channel.

However, unlike the ordinary channels, I get "This account cannot post in this channel" and channel contents does not load.

If I open the same channel from the list of channels, and not from the "Go" button of the notification, the channel contents loads normally.

The can belong to one workspace, but the issue is the same, can't view announcement channel contents if got there from a notification.

OK, that's interesting. I have no way to test this myself, because I have no access to such a Slack workspace. I suspect the notification message that Slack sends to clients must have some wrong channel ID in it, and the Slack web and mobiles clients have a hack to work around it or something like that, and actually redirect the view to the 'correct' channel somehow. It might be an extra field in the notification data. I may email you about this in a few days.

Thanks for reporting. I would have never found this on my own.