@J Kwon Di Welcome to Microsoft Q&A, Thank you for posting your here!!
You can check the login attempts from Azure portal navigate to the Azure Activity directory and check for sign-ins under monitoring and filter column with client app type "Browser" and "Mobile apps and desktop clients" please refer this document
Additionally, you can get directly get to the sign-ins logs using this link
Hope this helps!
Kindly let us know if the above helps or you need further assistance on this issue.
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