Samsung WA55A7300AE will not spin tub

Brand: Samsung
Model Number: WA55A7300AE
Main Symptom: Will not spin tub

What happens & when:
After washing a large load of blankets, the washer displayed an unbalanced (UB) code and stopped spinning. The motor runs and sounds normal, but the tub does not spin under power, even when the washer is empty. The tub spins freely by hand. SmartThings/Smart Care reports a generic spinning operation issue.

Error Code (if any):
UB (unbalanced)

Parts or tests already tried:
Power reset, calibration mode, rebalancing loads, Spin Only with empty tub. Confirmed this is a direct-drive model (no belt or external splutch). Wondering if DC97-18439B (Samsung DC97-18439B Washer Clutch Assembly OEM Part) would apply or if the failure is an internal drive/motor coupling issue.

Part link
https://www.appliancepartspros.com/samsung-assy-clutch-fddm-dc97-18439b-ap6884486.html

Based on the information provided I would check the clutch motor and the clutch assembly.
https://www.appliancepartspros.com/tub-assembly-parts-for-samsung-wa55a7300ae-us-00.html