Azure AD with 2 Tenants

[FEDERICO SPAGOCCI]

Hi, I need some information about using Azure Active Directory
on an Atlassian Cloud site.
A customer asked me if it was possible to link two Tenants to the same administration.
From the tests I have performed this does not seem to me to be possible, you give me confirmation of this or
it's possible to do it? and if so how?
Scenario.
Jira Software Cloud, Confluence, Atlassian Access
Microsoft Azure Active Directory, 2 Tenant Uk and Italy, how can I connect them at the same time
and enable SAML SSO? it seems to me that you can only succeed with one but not with both at the same time.
Thank you