Ok, this is an update on my previously posted response that sign in succeeded only when run via Chrome's Incognito Mode. This morning I ran a session using CCleaner to clear up all the cached browser data and then tried again. To my dismay, the sign in no longer worked even when using Incognito Mode in Chrome. However, I stumbled across the root cause and it was, after all, caused by the security software running on my laptop, which in my case is Kaspersky Total Security. Kaspersky has a feature called Secure Data Input (aka Secure Keyboard Input), which is basically a browser plugin designed to protect against malicious programs intercepting sensitive data. The solution is to configure an exclusion for the 127.0.0.1 website within the Kaspersky settings. After this, I was successful in logging in via Chrome (any mode). For anyone who may encounter same issue as me in the future, here's how a site exclusion can be configured: https://support.kaspersky.co.uk/13367#block4 The surprising thing, which threw me off the scent, is that invoking the "Pause Protection" feature for Kaspersky Total Security does not actually stop this secure keyboard input thing from continuing to run. Many thanks to Jay (@Jay Kumar SenSharma) and Geoffrey (@Geoffrey Shelton Okot) for your helpful responses.
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