In the Lightroom app on my iPhone,I can ‘t delete any imported photos,Even after uninstalling and reinstalling the app,the problem still remains.

Please update to the LR iOS app v11.3.3 that is now available on the iOS App Store.  Visit the app listing, and you should see the update become available.

Please explain in more detail. How do you try to delete a photo? What does (not) happen when you try it?

I am subscribed to the Adobe Photography Plan and use the same Adobe ID to sign in to Lightroom on both my mobile phone and iPad. Currently, I am unable to delete photos from my cloud album—they immediately reappear after being deleted, indicating a sync error. The web version of Lightroom also shows a “service unavailable” error, so I cannot resolve this issue on my own. I kindly request that the support team investigate and repair the cloud database for my account.