I use 1P on my iMac, MacBook, iPad and iPhone and the master password is working perfectly on the first three. Starting about two weeks ago my iPhone wouldn't accept my master password (and I seem to have lost the option of using a short pin). I have tried deleting 1Password from the phone, switching it off, then back on and re-installing 1Password - still can't get it to open. The master password is 100% correct - works perfectly on the other three devices. I think it is 1Password 7.03 (from my iPad). Help will be gratefully accepted!
1Password Version: Not Provided
Extension Version: Not Provided
OS Version: 10.13.1
Sync Type: 1password.com