I set the session expiration timeout for my org to 8 hours in sandbox. However, the session continues expiring at 15 minutes.
Can anyone let me know, whether I need to change another setting.
The settings for session duration and password policies at the profile level override the settings at the organization level.
Until you set the Session Timeout on a profile, the organization-wide Timeout value in the Session Settings applies to users of the profile. Once set, the Session Timeout on a profile overrides the organization-wide Timeout value for users of that profile. Changes to the organization-wide Timeout value will not apply to users of a profile with its own Session Timeout value.