What considerations should be taken into account when designing an SSO solution?

When designing an SSO solution, you should prioritize security, scalability, and user experience. So, choose a secure and widely adopted protocol like SAML, OpenID Connect, or OAuth 2.0. Them, do the following steps:

• Ensure robust encryption and consider multifactor authentication for added security.
• Employ scalability - the system should be scalable to handle a growing number of users and services.
• Design for a seamless user experience with minimal login prompts.
• Consider the integration capabilities with existing systems and applications.

Lastly, ensure compliance with data privacy regulations and have a clear policy for handling user data and consent, providing transparency and trustworthiness.