LastPass federation integration with different TLD

Hello,

I was looking into integrating LastPass and Azure AD with federation login (https://support.logmeininc.com/lastpass/help/how-do-i-set-up-federation-services-for-my-lastpass-enterprise-account-using-azure-active-directory) except that I ran into a problem with the fact that the current users on my LastPass Enterprise have a different TLD than my users on Azure, which cause an endless loop when trying to authenticate.

For example, on LastPass I have "user_a@example.com", but on Azure it's "user_a@example.uk".

I changed some emails on LastPass to match the domain my users use to login on Azure and it works just fine, but this would bring a plethora of other problems that I can't afford to deal with.

The question is, any way I can make Azure accept a domain different than the one used to login? I know some platforms can do this transformation on their side (I believe ServiceNow does this), but LastPass support wasn't very helpful.

Thank you,

Rafael