https://docs.microsoft.com/en-us/azure/active-directory/external-identities/one-time-passcode#when-does-a-guest-user-get-a-one-time-passcode
When a guest user redeems an invitation
or uses a link to a resource that has been shared with them, they'll
receive a one-time passcode if:
They don't have an Azure AD account
They don't have a Microsoft account
The inviting tenant didn't set up federation with social (like Google) or other identity providers.
One-time passcodes are valid for 30 minutes.
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