Lightroom Mobile Premium just cann't activate Premium Subscription purchased from Google Play

I successfully trialed and automatically paid for a 1-year Lightroom Premium service through Google Play Store. However, after the trial period ended, Lightroom showed that my subscription had expired. I tried using the "Restore Purchase" function, and after Lightroom indicated that the restoration was successful, it still showed that my subscription had expired. I attempted to contact Google, but they refused to issue a refund.