i was using 1password on my iphone a few years ago, but haven't use for quite long time because i changed to android. Recently i recall there should was some item stored in my 1 passowrd so i download 1passowrd 7.9.6 from app store. (this is the latest version i can see in my app store, maybe because my old iphone is iphone8 and system is still IOS13). Since i was using 1passowrd many years ago(in about 2018, 2019), i think i was using old version of 1password that time.
Then when i open the App i saw there is an iCloud option, so i click icloud the App told me 'We found your vault stored in iCloud." But i dont remember the master password so i cannot proceed. Is there anyway i can get back the vault data in my iCloud?
1Password Version: 7.9.6
Extension Version: Not Provided
OS Version: ios13
Browser:_ Not Provided