If you have any evidence of that period, you could add it to your application to back up your statement. If you don’t, provide a brief explanation.
More importantly , write to the CO outlining the relevant evidence you have already provided and how you meet de-facto requirements. Ask them to confirm if they still require the other evidence since you have already provided evidence that you were in a de-facto relationship from 2017 onwards.
Nick van Voorst
Registered Migration Agent 0640648
Please do not send Private Messages.
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Please note that this posting is of a general nature only. It does not constitute legal or migration advice and may not apply to your particular circumstances.