Hi @Navid Darvish Beigi ,
if you modify a Storage Account from LRS to GRS it means a copy of the Storage account will be created and synced in a second Azure region. It looks like the synchronization is still in progress and is blocking the deletion of the Storage Account. This means you have to wait until the sync of the GRS Storage Account finished before you can delete the Storage Account.
(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)
Regards
Andreas Baumgarten