Fail to create certain account after migrate from google email services to zoho email services

Fail to create certain account after migrate from google email services to zoho email services

Dear Sir/ Madam,

We had migrate our email services from google email services (paid) to zoho email services. 

Total we have 15 accounts, we have successful create 13 account in zoho email. But another 2 email account we fail to do show.

I have not idea, the message always show the user is existed, but i can't found any record in the user access.

Please advise.