@Viola Hao
Thank you for your post and I apologize for the delayed response!
From your issue, I understand that you have two Azure AD accounts and when signing into your web browser to check your apps, the browser is always choosing the incorrect account. The issue is still occurring even after signing out or in a private window.
Adding onto the solutions mentioned by Dillon - depending on the webpage that you're trying to visit, you can use Sign Out and Forget
option within your browser, so it forgets the other Azure AD account. If you're checking your apps within the Azure Portal, you can navigate to the tenant of your user directly via:
https://portal.azure.com/<domainName>
#For example:
https://portal.azure.com/testdomain.com
https://portal.azure.com/testdomain.onmicrosoft.com

If you're still having issues, can you share a screenshot of what you're seeing so I can gain a better understanding of your issue?
I hope this helps! If you have any other questions, please let me know.