Hello bros and sis

I have created a Zoho main account using google

Then I successfully connected to a domain called "sclf.org.hk"

Under this main account, I have created a domain email address

I go to the control panel in this domain email address, and accidentally delete the main account's connection （check the captured screen)

therefore, there are two problems:

1. my main account lost the domain, it shows that it is not connected to any domain now.

2. I do not know how to log in the domain email address ( as I try to add the domain email address into my main account, it shows that a verification code is sent to it, but I do not know how to log in it). where I log in to this account. as when I try to log in to zoho, it sends a verification code to this domain email address. but I do not know where and how to log in to this domain email address.
plz help