Zoho Invoicing messing with my Zoho email

Zoho Invoicing messing with my Zoho email

I subscribed Zoho invoicing service before and disconnected the service this year, as I do not need it any more.

Now I am setting up emails through Zoho, but I can't set up an existing email using Zoho. The error message says "User already exist in your org". It seems the problem may be that this email is already in Zoho's database.

Can Zoho please help? I need to continue to use this email badly.
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