PREVIEW_RECORD can not be used from a declarative action to go to a tab on an active record.
1) Create a playbook with an activity.
2) Make sure the activity's associated record is the same as the parent record and is an extension of Task table.
3) Scroll to the last card.
4) Click on the 'See All SLAs' UI Action showing in the header drop down. Nothing happens on the form, it does not navigate to the SLAs tab.
This is expected behaviour and by design. The wrong action is being utilized to open a tab.