Depending on the browser or operating system used, certain issues may occur, so please check the following first:

1.) Check if the same issue occurs on another web browser or mobile phone
2.) Clear browser cache and cookies
3.) Disable extensions or add-ons such as ad blockers

■ If you are using Google Chrome, please additionally check the following:
1.) Go to chrome://settings/content/cookies > Set the ‘Block third-party cookies’ option to disabled
2.) Go to chrome://flags/ > Set the ‘SameSite by default cookies’ option to disabled
3.) Close and restart the browser > Try logging in again
4.) Try logging in using Google Chrome’s Incognito Mode