If you need only some of your employees to clock in and out via chosen methods, you can restrict this in line with your organization's internal policies.
Configuration → Methods → Chosen method (i.e. Web browser, mobile app, Slack etc.) → Configure
Choose if the method should be allowed to all users in the organization or only selected group of users/teams.
Save the changes.
Please note, that each method can be restricted to different users/teams, and they can use allowed methods alternately, in line with the permissions granted. Example: user can start their shift via mobile app, mark a break with the web browser, and finish the shift with Teams app.