Post something that proves otherwise.
From your link.
During this period Palestine was first placed under military rule and then under civil administration. From 9 December 1917 (when the province of Jerusalem was occupied by the British army as part of World War I in which Britain and Turkey were enemies) until the adoption of the Palestine Mandate on 24 July 1922 by the Council of the League of Nations, the international legal status of the country remained undetermined. As a result, the nationality of Palestine inhabitants, like that of the inhabitants of other ex-Ottoman territories at the time, remained similarly undetermined
BritainÂ’s occupation did not alter, in law, the international status of Palestine as an occupied Turkish territory. The allied powers meanwhile gathered in San Remo, Italy, to discuss a deal with Turkey and determine the future of Palestine (then including Trans-Jordan), along with Iraq and Syria (then including Lebanon).
As the unilaterally declared mandate had no international legal effect, Palestine remained, at least nominally, an Ottoman territory. Britain itself accepted this international legal position
In addition to being Ottoman citizens on the basis of the international law of state succession, PalestineÂ’s inhabitants continued at the same time to be Ottomans in accordance with the 1869 Ottoman Nationality Law. The ongoing validity of the 1869 Law was part of the general application of Ottoman laws in Palestine.
Such validity of Ottoman nationality at the time can be explained by the general rule in international law that occupation or conquest does not provide title to the occupying power over the occupied territory.
Although the inhabitants of Palestine remained Ottoman citizens according to international law, in practice they started to be
gradually regarded as Palestinians ( take note this was not a legally binding change of nationality )
As occupying power, Britain had become responsible for the international relations of Palestine and for protecting its inhabitants abroad.44 Britain, as such, found itself compelled to take certain measures to regulate the inhabitants’ nationality. To this end, the government of Palestine, which was the authority established by Britain to administrate the country, issued provisional nationality certificates to Ottoman residents in Palestine; granted Palestinian passports and travel documents; extended diplomatic protection to those inhabitants residing and travelling abroad; and made a clear distinction between citizens and foreigners regarding the admission into Palestine as well as political and residence rights. ‘Palestinian’ and ‘Palestinian citizen’ terms were routinely employed.45
Shortly after replacing the military order by a civil administration, a preliminary system of Palestinian passports and travel documents was set up in August 1920 by the Palestine Passport Regulations
In order, apparently, to be applicable to all residents of the country (natives, migrants, stateless persons, refugees) the Passport Regulations employed the term ‘inhabitant of Palestine’ rather than ‘Palestinian citizen
Palestinian nationality existed despite the lack of comprehensive legislative regulation..
So no legally recognised Palestinian nationality, just a British one that granted protected Palestinians the same consular rights as say Indians and Jamaicans