Confirmed by Microsoft:
“Content Search is not available on Office 365 right now, but we are working on enabling it in the future.”
Let’s hope this web part comes available as soon as possible!
Jasper Oosterveld is a Microsoft MVP and Modern Workplace Consultant from InSpark within the Netherlands. On a daily basis, he works with customers to implement the Modern Workplace with Microsoft 365. Jasper focuses on collaboration, communication, security, adoption and governance. Jasper loves to share is expertise and love for Microsoft products with everyone who is willing to listen.