Hi @tarou chabi
Your enterprise application should have been successfully registered as it has popped up the authorization page. You can find it by going to the enterprise application blade in the Azure portal and entering the enterprise application name.
The page keeps failing to load may be related to your network, you should check if the network connection is smooth and refresh the browser page, then try running the URL again. If it still won't load after you've ruled out network issues then you should consider switching to another browser.
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