If you have enterprise level needs for a full customer identity solution, especially if your company activates in Europe, let me suggest you https://www.iwelcome.com/ (disclosure: I work here as an engineer): long history (founded in 2011), very reputable companies and institutions as long term clients, superb customer support, 0 security breaches, and the delegated user management solution we have is among the best in the industry, if not the best - I personally haven't seen anything like this, even though I tried Cognito and Auth0.