AADSTS700056: User account does not exist in organization.

Dear محمد شحاته,

Good day! Welcome to Microsoft Q&A forum!

Based on your description, I understand that you have an error AADSTS700056: User account does not exist in organization.

To better understand the situation, could you please confirm the following:

• Is this your account or someone else's?
• What type of account is experiencing the issue? Is it a personal account (e.g., hotmail.com, live.com, gmail.com) or a business account (e.g., onmicrosoft.com, customdomain.com)?
• Are you a user within a business tenant or a guest user?
• Is this the first time you have encountered this error while logging in, or have you successfully logged in before?
• Which website are you trying to access when this issue occurs? If possible, please provide a detailed screenshot of the error and the login page.

Your confirmation would be very helpful in ensuring you receive the most suitable support!

If you’re able to share a bit more about your situation, I might be able to suggest some helpful next steps. 

Kindly let me know when there are updates or if you need further assistance. Any updates you’re able to share would be really helpful. I appreciate your time and look forward to hearing how things are going! 

Thank you for your time and patience.