Veeam v13 Credential fill

Veeam recently moved to a new set of 'Appliance' based systems, with their own web pages.
I tried to set them up in RDM as Sessions with Cred fills, but I ran into a problem.

The 'id' fields appear to be be generated on each session, so using the 'discover' option is useless.

I gave the 'Automatic' a try and it appears to work, but it only does the initial login and not the OTP.

It created what appeared to be variables ..

[UserName] [Password] [Enter]

I tried [otp] and [Otp], and it didn't work .. I am guessing it's probably something like [One-Time-Password].

Where do I find the doc for these ? As it's not your usual %USERNAME% variable.