I set up a one-time password with IFTTT. When I added the IFTTT Login to my Apple Watch and tried to use the one-time password to log in, it kept failing. I then looked at the one-time password on my watch and noticed it was different than the one time password on my MacBook Pro and Mac Mini (those two devices had a synchronized one-time password). I was able to use the one-time password from the Macs to log in.
There seems to be a synchronization issue between the watch and the 1Password app on my iPhone.
Right now, my watch is displaying 344006
while at the same time my iPhone is displaying 220671 (as are both my Macs)
I have removed the login from the watch and re-added it, but still the same issue. I have other one-time passwords added to my watch and they are all synchronized with 1Password on the iPhone, no issues.
1Password version on my Macs are
Version 7.8.4.BETA-0 (70804000)
1Password Version: 7.7.3 iPhone
Extension Version: Not Provided
OS Version: Not Provided
Sync Type: Not Provided