Hi @Ros C ,
What browser are you using?
If it is the credential to connect to the report server, user authentication is required when you open the web portal url; if it is data source credential authentication, authentication may be required when you open the report (based on your data source authentication method).
When you export the report, you are prompted to enter the authentication to connect to the report server. In view of this behavior, I guess this may be related to the settings of your browser.
Please try to change your browser to open the report manager to see if the issue is resolved.
Best Regards,
Joy
If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.