Hi Phung Huan,
We appreciate that you posted back and confirmed the scenario with us, we also appreciate that you spent your precious time doing those tests.
We have checked the description you provided, it seems that you can only use your account to export specific members’ items when clicking Export to Excel, however, the other colleagues can export to Excel without any problem. At the same time, when you tried another list in another site, you encountered an error message.
Given this situation, this issue may be related to your account or your local environment, since you mentioned this issue doesn’t occurs on the other colleagues’ side, we’d suggest you go to you colleague’s computer and sign in with your account, then you can check if the same problem will occur.
If the same problem still persists after trying in your colleague’s computer, this issue is related to you account, and may need to be checked from background. The best way to troubleshoot the issue is to report the issue to the related Team. So we suggest you contact the administrators in your organizations and open a support ticket in the Office 365 admin center via the steps in the article for further help. The support team there has the correct escalation channel for this case. This is also the most efficient way in handling this kind of issue.
If the same problem doesn’t occur, this issue may be just related to your local environment, please feel free to post back and let us know, and we will try our best to help you.
Thank you for your patience.
Best Regards,
Sukie