Hi
nothing, the invite doesn't expire:
You can invite guest users to the directory, to a group, or to an application. After you invite a user through any of these methods, the invited user's account is added to Azure Active Directory (Azure AD), with a user type of Guest. The guest user must then redeem their invitation to access resources. An invitation of a user doesn't expire.
Taken from here:
https://learn.microsoft.com/en-us/azure/active-directory/external-identities/add-users-administrator
Hope this helps,
Thanks
Michael Durkan
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