MS Apps Auth Effected by Cloudflare Zero Trust

We are in the process of trialing Cloudflare Zero Trust.
Our deployment is very simple at this stage.
2 test devices using Warp to provide visibility of usage etc.
No Tunnels
When the test machine are connected through Warp, the M365 auth on the devices seems to break.
This is an example of excel that is located in Onedrive and the Auth to onedrive failing


But the same is seem across all MS apps.
After disconnecting Warp everything works as expected.

The only policies applied is the Block Malware DNS policy. I’ve added the ‘Bypass Decryption of Office365 Traffic’ from the Settings menu, but that had no effect.
We don’t want to directly route O365 traffic as would like to maintain full visibility.
Any help appreciated