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One of my client report to me when she login she will be auto logout after 1 second, even when I open new account to her and change password.
I don't see any other client complaint the same question.
I have no idea how to fix this for her.
I logged in to https://www.isuperman.tw/supermail with the login details you've sent me, but I was never logged out automatically though. I clicked around the interface from page to page and was never logged out.
Can you ask your client to try another browser or internet connection.
Can you check this video to show the exact problem my client sent to me, she also ask somebody to test login and the same problem, but in my compution is fine, very strange.
I've checked the video. I suspect it's some kind of browser extension issue. Can you ask your client to try another browser, or disable browser extensions in her current browser, or use a browser that has no extensions installed.