My case: I am an Egyptian national and my age is between 20 and 45 years. I have a Schengen visa valid from 6 July till 1 Jan.
Question: Can I use it to obtain an e-visa to enter Turkey on 2 July? Is my Schengen visa considered "valid" when entering Turkey?
Details: According to the website of the Turkish ministry for Foreign Affairs for Egyptian nationals:
Egypt: Official passport holders are exempted from visa for their travels up to 90 days. Ordinary passport holders are required to have visa to enter Turkey. Ordinary passport holders may obtain their 30-day single-entry e-Visas via www.evisa.gov.tr, provided that they have a valid Schengen or USA, UK, Ireland visa or residence permit and that they travel to Turkey with Turkish Airlines or Egypt Air.
Besides, those ordinary passport holders who are under 20 or over 45 years old may get their 30-day single-entry e-Visas via the website www.evisa.gov.tr.
So I need to apply for an e-visa at https://www.evisa.gov.tr. When I go through the questions there, under the prerequisites listed for ordinary passport holders it says:
I am below 20 or over 45 years old; or I have a valid Supporting Document (Valid visa OR valid residence permit from one of the Schengen Countries, USA, UK or Ireland). E-visas are not accepted as supporting documents.
Which is unclear to me regarding whether my Schengen visa is considered "valid" when travelling before the dates on the Schengen visa. I tried to contact the Turkish authorities via their contact form to get a reliable answer. They answered promptly but with a non-helping standard answer and a broken link.