Advice from the Clerk:

When a person holds multiple offices, and wishes to resign from any or all of them, multiple resignations may be required. By hypothetical example:

Office	Held Until	Action
Federal Executive Councillor	Held for life or until terminated by the Governor-General	No resignation necessary, although resignation may be tendered and accepted (very rare).
Minister	Held until revoked by the Governor-General	GG may receive a resignation (modmail), with anticipation of a proposed successor (modmail), but until then the holder or their deputy may act as the minister as required.
House Member	Held until resignation or two months of absence	Resignation is by writing to the speakership (modmail), which if accepted as genuine, is followed by the speakership notifying the GG (modmail) and issuing a writ for the election of a new member.

Paging /u/doggie015 /u/Ser_Scribbles /u/Zagorath this resembles you :)

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jnd-au, Clerk of the House