Do your names match across your documents?
The commonest reason a bundle of paperwork falls apart is not an error or a missed deadline. It is that three papers call the same person three different things. Olena and Yelena; Іваненко and Ivanenko; a Sofiya who became a Sophie. Officially it is called a discrepancy in spelling, and you usually discover it at the moment of refusal. Type the spelling from each document and see exactly where the break is.
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What this shows
Different spelling systems are not different names, but officially they are still a break. The Latin spelling of Ukrainian names is set by an official table (Cabinet resolution No. 55 of 27 January 2010). Your older documents may have been spelled under different rules, or transliterated from Russian — which is where Yelena for Olena and Chernigov for Chernihiv come from. In practice it is resolved one of two ways: you ask for the spelling from your previously issued document to be carried into the new passport, presenting that document as the basis; or you keep both documents together so the office can see the link. Ask about this when you apply for the passport, not afterwards.Different names are joined by a document, not by an explanation. Depending on what happened it is one of these: a marriage or divorce certificate, if the surname changed; a name-change certificate, if the change went through the civil registry; an adoption record. If none of them exists, what remains is a court: the Code of Civil Procedure (art. 315(1)(6)) allows a court to establish that a TITLE DOCUMENT belongs to a person whose surname, given name, patronymic, place or time of birth as written in it differ from those in their birth certificate or passport. It is a separate proceeding and it takes time, so start it well before the document is needed.A mechanical match is not an official’s decision. The tool compares spellings, not documents. It cannot see dates, seals, an error in a patronymic or a wrong date of birth — and those are what a refusal is more often about.
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This is not legal advice and it is not an official check. The last word belongs to whichever office will accept your documents.

