For Google Workspace.

For Microsoft 365.

Question: 

What should I do when the Login page for Outlook Web Access (OWA) appears instead of the Login page for Access Control while using SharePoint?

Answer:

Please access the SharePoint with the URL below to display the login page of the access control.

* This is the Microsoft 365 specification. So, please check the details with Microsoft. 

■ Login URL of SharePoint

https://login.microsoftonline.com/login.srf?wa=wsignin1.0&whr=“Customer Domain”&wreply=“The value resulted from percent-encoding of the sharepoint page URL”

e.g.:
 If the used domain name is [hde.co.jp] and the contract domain（Managed）is [hdeone.onmicrosoft.com],

https://login.microsoftonline.com/login.srf?wa=wsignin1.0&whr=hde.co.jp&wreply=https://hdeone.sharepoint.com/default