The error message just posted is a strong clue...
Part of the requirement SiLabs has via their 700 series certification has an impact on S0 security devices. They insist that S0 devices be "bootstrapped" to S2... the idea is, I guess, that S2 is a better security than S0.
I have two Yale locks that joined my newest C-7 (2 years ago) that are also S0 only.
The thing I see is that the Dataline for S2: shows 128, which is the code for 'not S2' -- S2 joined devices have larger numbers such as 131 and 132 as shown in this:
Perhaps this can clarify a bit more:
