the questionnaire asks for scope 1 2 and 3 emissions but that is not in my file

Three scopes, three different evidential burdens

If scopes 1, 2 and 3 are all missing from your file, don't assume you can deliver them all at once. Scopes 1 and 2 can usually be reconstructed with limited effort: scope 1 comes from your own consumption of gas, fuel and refrigerants, scope 2 from electricity and heat you purchase. Both can be traced back to invoices you presumably already have, even if no one has ever converted them into an emissions figure. Scope 3 is a different matter: that is the emissions across your entire chain, from procurement to end of life of your product, and it requires a separate exercise or external calculation. So don't give all three the same status.

For the list itself, this means you answer per scope separately, not with a single "no" for the entire block. For scopes 1 and 2 you can often arrive at a figure within a reasonable timeframe, so "not yet available, to follow" is a different answer than for scope 3, where "not measured" is more realistic if you haven't conducted a chain analysis. Check per scope what your customer is asking exactly: the definitions sometimes differ between portals, and that's what you read what the question about direct emissions (scope 1) exactly means and what is meant by indirect emissions from purchased energy (scope 2).

Where the scope classification itself comes from

The classification into scopes 1, 2 and 3 is not a legal requirement but the standard classification from the GHG Protocol, and that is also the classification that the EFRAG VSME — the voluntary basic reporting standard for non-listed SME companies — adopts in its basic module. That is why virtually every customer portal uses the same three terms: they cite the same source, not their own definition. More about how scope 3 is concretely requested can be found at the question about emissions in the value chain (scope 3).