To narrow down this issue, please verify the followings:
- Check if your current connection has enough permission to access the site:
- Clear browser cookies and caches or change a browser to have a try.
- Select "Enter custom value" and type in the link manually(
https://sharepoint.dxc.com/sites/RR-APMO/Delivery/PD/DO
) to see if it makes you proceed.
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