Users may report seeing an error for the Activity component on Lightning record pages:
If the Activity Timeline is not selected in the Record Page Settings, the error may occur. Check if users have adjusted the Personalize Your Record Activities View Settings or if Admins have Set the Default Activities View to 'Related list'.
To resolve the error for all users, toggle the setting from 'Related list' to 'Activity Timeline' as follows:
1. Setup > In Quick find, search for "Record Page Settings"
2. Select Activity Timeline and Save
3. Confirm if the user can now see Activity related list.
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