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Once a user has logged in BC in the source tenant you can revoke the license from O365 but the user will remain in BC. This should not be a problem, however when the environment moves to another tenant, all users are also moved and deleting them is impossible as the same error is given as in the source tenant (Users can only be removed in O365). But in the target tenant these users never existed so removing them is not possible at all in O365.
It would be great if the tenant move skips moving the user table entirely to prevent this. Or create a possibility to remove users from BC which do not have a valid BC license.
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