In our case, we have an employee who had moved from one entity (company) to another entity. The employee in HR and the user in System Admin were still recording the email of the previous entity. Once the email was changed to the email of the new entity the problem was resolved. Also I changed the Company of the user in System Admin of the new entity. If using the test environment you have to do the same.
Kevin mentioned AOS, not AOT. Can you tell us if this is a Microsoft managed instance or that your environment is on-premise? If it is on-premise, then you can also check SSRS permissions if the user has appropriate access.
Can you explain a bit, what is this email ID about? when you are using email id while generating report?
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