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Title
App Auth login page is showing blank screen when connecting to SPO site using Office 365 OAuth/Standard/ADFS Authentication -
Description
Unable to complete App Authentication - App Auth login page is showing blank screen when connecting to SPO site using Office 365 OAuth/Standard/ADFS Authentication.
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Cause
This is because there is an policy restriction where it restricts the Office 365 OAth App from Authentication. -
Resolution
Disable the policy restriction where it restricts the Office 365 OAth App from Authentication to resolve the issue.