Hi @Max Lu ,
Thanks for your post! There are a few reasons why the "Hmmm… can't reach this page" error might occur:
1) There is a problem with the URL format. Make sure to include https:// in the prefix for the Entity ID.
2) There are conditional access policies in place blocking the authentication, or there is a network connectivity problem.
3) The Assertion Consumer Service URL is not configured.
4) There is a firewall blocking connectivity.
The best way to log more information about the error is to capture a Fiddler trace when this happens.
Let me know if you are able to test these things or provide the trace.
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