I'm using 1Password 18.104.22.1685 on my Win 8 desktop and 5.4.3 on my iPhone 5S. I was able to set up the wifi sync fairly easy, no problem. I don't sync everyday or so, only when I update things. The updates are done mostly on my desktop.
Over this week I changed a couple of my passwords and stuff including the master password. When I wanted to sync updates to my phone, I went to Settings>Sync>Sync Now on my phone, nothing happened. Tried it a couple of times, still nothing. Figured I'd disable the sync and enable it back again (Settings>Sync>Sync Service>Disable). It worked, it listed my desktop, secret phrase matched and also asked me the master password for the key on my desktop, I entered my updated master password and everything was synced.
Since I'm using TouchID I haven't had the need to use my master password on my phone, until I restarted it. After which the updated master password wouldn't open the vault. I tried the previous one, it worked. This is strange considering the updated password works on the desktop. How can two different password unlock the same vault, or by doing a wifi sync am I just transferring the data of one vault to another one on the phone? And technically they are two different vaults and I should update the master password separately? Is this different from using Dropbox for sync where you essentially share the key and changing the master password in one place suffice?
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