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Require a mobile passcode In an Enterprise organisation, org owners can require all members and guests who access Slack from unmanaged mobile devices  to use a passcode, fingerprint or facial scan after a set amount of time away from the Slack mobile app. With this setting enabled, org owners can further secure unmanaged mobile devices by limiting how much information is displayed in Slack mobile notifications.
What to expect 
Once a passcode is required for your org, members and guests will be prompted to set up a six-digit passcode (and a fingerprint or facial scan if they have a compatible device) the next time that they open the Slack mobile app. 
Members and guests won't be able to take screenshots on Android  devices while viewing any workspaces in your Enterprise org. The ability to prevent screenshots on iOS devices isn't supported at this time.  
 
Org owners can choose how mobile notifications will appear on unmanaged mobile devices:
 Don’t show any message content   Only show sender names     
 
 Show all message content   
 
 
 
 
Enable secondary authentication 
From your desktop, click your organisation name  in the sidebar. 
 
Hover over Tools & settings , then click Organisation settings . 
Click    Security  in the left column, then choose Security settings.  
 
Under Mobile passcode , click on Enable . 
Use the drop-down menu to select the duration after which users must reauthenticate when away from the mobile app. 
Below Notification previews , select an option. 
Click Enable . 
 
 
Tip:  If you're a member or guest of an Enterprise org with mobile passcode enabled, learn how to set up a mobile passcode or biometric authentication  on your iOS or Android device.
Who can use this feature? 
Org owners   
Available on Enterprise  subscriptions 
 
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