I'm not able to sync my leads from Zoho CRM to Zoho Marketing Automation

I'm not able to sync my leads from Zoho CRM to Zoho Marketing Automation

Hello!!

We are trying to run a trial marketing automation within our internal team while trying to integrate leads from Zoho CRM. But as we tried to sync leads from the Zoho CRM to Zoho Marketing Automation an error pops up displaying "Organization is already integrated." 

But under the sync service section of Zoho Marketing Automation, the Accounts are still not associated with each other.
Please help to overcome this issue so we can run a test. And further, implement it to our purpose.

Please find the attachments below for the clarification of the problem.