Tenant to Tenant Migration - New users and existing guests conflict

%3CLINGO-SUB%20id%3D%22lingo-sub-2067081%22%20slang%3D%22fr-FR%22%3ETenant%20to%20Tenant%20Migration%20-%20New%20users%20and%20existing%20guests%20conflict%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-2067081%22%20slang%3D%22fr-FR%22%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EI'm%20trying%20to%20find%20the%20best%20process%20to%20migrate%20users%20from%20holding%20A%20to%20holding%20B.%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EUsers%20in%20holding%20Already%20exist%20for%20the%20most%20part%20as%20Guest%20Mail%20Users%20in%20holding%20B.%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EProvisioning%2Fprestaging%20of%20tenant's%20A%20users%20in%20holding%20B%20is%20done%20through%20the%20creation%20of%20accounts%20with%20a%20DNS%20suffix%20in%20tenantb.onmicrosoft.com%20(eg%3A%20usersA%40tenantB.onmicrosoft.com)...%20But%20when%20i'll%20switch%20the%20domain%20name%20used%20by%20the%20users%20of%20tenant%20A%20in%20tenant%20B%20(cutover)%2C%20I%20will%20have%20a%20conflict%20to%20reallocate%20the%20domain%20name%20on%20the%20UPN%20of%20provisoned%20users%20because%20a%20guest%20account%20with%20this%20email%20address%20already%20exists...%3C%2FP%3E%3CP%3E%3CBR%20%2F%3EDoes%20anyone%20know%20the%20best%20practice%20for%20this%20kind%20of%20situation%3F%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EThank%20you%2C%20thank%20you.%3C%2FP%3E%3C%2FLINGO-BODY%3E%3CLINGO-LABS%20id%3D%22lingo-labs-2067081%22%20slang%3D%22fr-FR%22%3E%3CLINGO-LABEL%3EMicrosoft%20365%3C%2FLINGO-LABEL%3E%3C%2FLINGO-LABS%3E
New Contributor

 

I'm trying to find the best process to migrate users from tenant A to tenant B.

 

Users in tenant A already exist for the most part as Guest Mail Users in tenant B.

 

Provisioning/prestaging of tenant's A users in tenant B is done through the creation of accounts with a DNS suffix in tenantb.onmicrosoft.com (eg: usersA@tenantB.onmicrosoft.com)... but when i'll switch the domain name used by the users of tenant A in tenant B (cutover), I will have a conflict to reallocate the domain name on the UPN of provisoned users because a guest account with this email address already exists...


Does anyone know the best practice for this kind of situation?

 

Thanks !

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