Quoting Tom Segev’s The Seventh Million: The Israelis and the Holocaust, page 29:

Others said that there was no reason not to negotiate with Adolf Hitler to save German Jews and bring them to Palestine; after all, Moses had had no qualms about negotiating with Pharaoh to take the children of Israel out of Egypt.⁶⁴

In this struggle for control of the Zionist movement, the proponents of the haavara agreement prevailed. The next Zionist Congress, meeting in Lucerne in 1935, reaffirmed the policy. The Vaad Leumi, in the end, also rejected the boycott.⁶⁵

The haavara agreement would in the end shore up the Jewish Agency—then almost bankrupt—and grant it renewed momentum. But this victory was not without cost; it effectively isolated the yishuv from the dominant current of world Jewish response to the rise of the [Third Reich]. Nevertheless, the pragmatists were convinced that the boycott of [the Third Reich] could not advance the interests of Palestine, that their ends could best be accomplished through contact with the [Reich].

Thus the leaders sought to keep relations with [the Third Reich] as normal as possible: Two months after Hitler came to power the Jewish Agency executive in Jerusalem had sent a telegram straight to the Führer in Berlin, assuring him that the yishuv had not declared a boycott against his country; the telegram was [supposedly] sent at the request of German Jewry in the hope of halting their persecution, but it reflected the Jewish Agency's inclination to maintain correct relations with the [Fascist] government.

Many years later, Menahem Begin revealed that the Zionist Organization had sent Hitler a cable of condolence on the death of President Hindenburg.⁶⁶

There were further contacts with the [Fascists] over the years. Working in cooperation with the [Reich’s] authorities, the Jewish Agency maintained immigration agents in [Fascist] Berlin.⁶⁷ Georg Landauer, for example, carried a letter, in German, certifying that the Jewish Agency had authorized him to conduct negotiations with the Third Reich about vocational training for prospective immigrants and arrangements for the transfer of their capital. The letter was signed by Arthur Ruppin and David Ben‐Gurion.⁶⁸

(Emphasis added. Cheers to PalestineRemembered.com for showing me this.)