I want to move my emails from Microsoft 365 to Zoho mail and so decided to test it by creating a couple of free email accounts.

However, I ran into issues when I tried to add an email address (hosted on 3rd party server) into my Zoho Mail account. Zoho mail won't allow me add the specific email because I already added it as a user in Zoho Invoice.

I've tried contacting Zoho for help but their reply suggests that I should delete the account and organisation. When I reply with more details, I just receive generic, robotic replies (exact same response to my different emails) that don't solve my problem.

I use Zoho Invoice and now Zoho Mail for the same organisation, and while both products  but both products are linked to the same Zoho User ID, they are under different organisations. I don't want to lose my Zoho Invoice data and wanted to know if I could bring that product under the same organisation as my Zoho Mail instead of deleting it. 

I'll appreciate any help from anyone who understand how accounts and organisations work in Zoho.