ReadonlyaacReadonlycodeThe verification code sent to the challenge's contact point.
Optional ReadonlycontextRequest context. Omitted by default; Android passes its login-home context.
Readonlysubmitserver_params of the code-submission action
(AccountRecoveryBloksSelectChallenge → submitServerParams) — echoed
verbatim, QPL ids included.
The account-access-context token the flow chains into
client_input_params.aac. The 451 recording sends it as an empty string when the process never set one; it is always on the wire.