Hi, Based on your description, we are unable to find the exact cause of the problem. Could you please provide us with more information about this issue, e.g. screenshots of the errors reported, etc.? In addition, according to the official Microsoft documentation, this may be because the Dynamics 365 instance is associated with a security group of which you are not a member. You can ask the Dynamics 365 administrator to add you to the security group associated with the Dynamics 365 instance you are trying to access. The link to this documentation is as follows Error when signing in to Dynamics 365 - Dynamics 365 Sales | Microsoft Learn I hope my answer is helpful to you! If you have any other questions, please feel free to contact me. Best Regards, Rudy Zhang
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