What do the guidelines say about registration forms and personal information?

Section 5.6 of the guidelines says organisations should collect personal information only when necessary and with consent (parental consent for children). Recommended practices include:

• Accepting statutory declarations in place of identity documents with mismatched sex or gender markers.
• Offering non-binary and gender-neutral title options.
• Providing preferred name and pronoun fields.
• Securing stored data and limiting disclosure of a player's trans or gender diverse status without express permission.

The guidelines also note that requesting additional information from trans and gender diverse people may be unlawful in some circumstances. Section 4 lists the Privacy Act 1988 (Cth) and the Australian Privacy Principles as applying to gender identity information.

Sources: https://www.ausport.gov.au/integrity_in_sport/transgender_and_gender_diverse_people_in_sport/guidelines/how_can_my_sporting_organisation_be_inclusive and https://www.ausport.gov.au/integrity_in_sport/transgender_and_gender_diverse_people_in_sport/guidelines/what_does_the_law_say