naturalisation application change of address

[minxmit]

I applied for naturalisation in early July and have now changed addresses and using this form https://eforms.homeoffice.gov.uk/outrea ... pdate.ofml to update address. However, there is field for
Your application registration card (ARC) number in this form. I donot have any ARC. I applied through 5 year Tier 1-2 ILR plus 1 year for naturalisation. should i leave this field blank?

[AmazonianX]

I applied for naturalisation in early July and have now changed addresses and using this form https://eforms.homeoffice.gov.uk/outrea ... pdate.ofml to update address. However, there is field for
Your application registration card (ARC) number in this form. I donot have any ARC. I applied through 5 year Tier 1-2 ILR plus 1 year for naturalisation. should i leave this field blank? As you got no ARC, leave it blank. Hope the application progressed?