At the end of 2019, when Orange announced its latest five-year plan, called Engage 2025, its fledgling banking arm was given center stage as a key source of growth. But now, there are reports that Orange may sell a controlling stake in the four-year old bank amid heavy losses. In Engage 2025, Orange identified three main sources of revenue growth in 2020-2025 – the Middle East and Africa (MEA) region, business-to-business (B2B) services, and financial services, including the Orange Bank. CEO Stéphane Richard would seem unlikely to give the bank that kind of profile today, though he insisted last week that there were no plans to give up control of the unit, and that it remained strategic to Orange. In…