parked domain (in cpanel) of wordpress multisite (primary site) redirects to its signup page

I have wordpress multisite - xyz. com.

In its shared-server hosting cpanel, I parked domain (abc. com) so that it can be redirected to xyz.com (without showing xyz.com in the browser; only to show its content on webpage). However, it shows sign up page of xyz. com.

[before that i followed steps inadvertently - I installed domain mapping plugin and followed the installation instructions and added the domain abc. com in cpanel as i thought that i can use this plugin to map the abc. com to the primary domain). When I came to know that this is not possible by this plugin, i deleted the abc. com and added it as parked domain and then de-activated the domain mapping plugin.]

Can you please guide and help me.
I have made access open from backend.

Pooja