Permission Denied message when attempting SSO login on a Windows 365 PC

Although my SSO credentials work fine to connect to Forticlient (7.2.5.1053) from my Win11 24H2 laptop, when I try using the same credentials on a Windows 365 24H2 (with Forticlient 7.2.5.1053) machine, it gets to about 48% and then gives me a Permission Denied error.

I'm not being prompted for MFA on the Windows 365 PC so am I missing something there?

Can anyone shed any light on why this may be?

Many Thanks,
Steve