The function was removed or renamed in a recent SDK update.
Ubisoft’s servers can take 5–15 minutes to reflect newly earned achievements due to: uplayachearnachievement could not be located new
Provide a reliable in-app feature that detects, diagnoses, and resolves "could not be located" errors when unlocking or reporting achievements from UPlay (Ubisoft Connect), improving user success and reducing support requests. The function was removed or renamed in a recent SDK update