iPads (10th Gen) not showing Azure AD login screen in Entra Shared Device Mode at boot up

Hi there,
We manage a range of mobile devices in Intune, both Android and Apple, and to date we've achieved many efficiencies whilst increasing security!
We are currently purchasing 80 x iPads (10th Generation iOS 17.2) which we want to run in shared device mode.
The Microsoft Procedure is well documented here (Nov 23):
https://aus01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flearn.microsoft.com%2Fen-us%2Fmem%2Fintune%2Fenrollment%2Fautomated-device-enrollment-shared-device-mode&data=05%7C02%7Cianhe%40glch.org.au%7Cc454c0ae930c405627a608dc073536d5%7C4c92b31cb897461888f65ee56d6eabfd%7C1%7C0%7C638393172339141191%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=aR23HB2MGXmvv30XpIjBGpP2ZnejPqCWyFPxjDubTDw%3D&reserved=0
According to the documentation, Microsoft Intune and Micrsoft Authenticator support the Apple iOS Microsoft Enterprise SSO plug-in that integrates with iPad shared device mode.
The SSO aspects are working well once logged into the first App. However, I can't get the iPads to boot up at the login screen for users to enter their credentials (nor logout ready for another user).
How can I find support for this issue? I can't find other technicians talking this issue and so I'm open to any suggestions.
Ta, Ian Hearnes Ian_Hearnes