Office 365 SAML - Have to enter username twice

I'm currently testing Office 365 SAML integration with AuthPoint, I've followed the published integration guide and have it all working, however there is one bug bear.

When logging to Office 365 ( I have to enter the username twice, once on the Microsoft login UI, after which redirects to the WatchGuard login page where i have to re-enter the username again.

Is this expected behavior?
Is there a configuration that can change this?

Any ideas?

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