Invalid client secret error even after entering correct details.

Dear Zoho Team,
I am trying to setup Zoho mail SMTP on my WordPress website using Zoho mail WordPress plugin. But plugin is showing error ‘invalid client secret’.

However i have entered all the details correctly that is:

1. Where is your account hosted? – In my case it is ‘mail.zoho.in’
2. Client ID
3. Client Secret

Kindly fix the bug in WordPress plugin.

Thank You.