Hi @phuong.le,
One possible reason for this failure is the network configuration on your side.
I remember once I worked on a case where our customer’s machine, under a corporate network, could not access CDN URLs with libraries that had been utilized by the Login widget, and as a result, requests within the respective flow were malformed.
It’s hard for me to tell what exactly is happening here, as I can’t reproduce this issue under regular network settings (it works for me well). Maybe requests sent from the machine are incorrectly routed.
If you can submit a support case, please attach a HAR file there (in the Community, due to security reasons, we do not accept HAR files).
I remain available in case of further questions.