Customising ADFS Login Pages

I have noticed that companies using ADFS and Office 365 receive a custom login page when they type their e-mail address, consisting of a logo and a picture.

In a single ADFS deployment with multiple UPNs, can this be customised per

I.e. If I type in I get company1's template
I.e. If I type in I get company2's template

Or is a separate ADFS deployment required to get a custom theme per company?

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Vasil Michev (MVP)Commented:
Um, why are your users hitting the login page at all? One of the biggest benefits of using AD FS is the seamless SSO experience after all. Or do you mean the O365 portal page?
tegeniusAuthor Commented:
Sorry.. the O365 portal page for external users :)
Vasil Michev (MVP)Commented:
For the portal/access panel page, the modifications are done on per-tenant basis, so you will need different O365 tenants. The process itself is very basic:

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