When I am trying to add a site via add new site its throws error as following “The zone name provided is subject to a hold which disallows the creation of this zone. Please contact the domain owner to have this hold removed.”
If you are trying to add to a different account, you need to contact whoever in your organisation has the original account and ask them to remove the hold.
If you have acquired the domain somehow then you will need to raise a support ticket so Cloudflare can verify with the account that placed the hold on the domain.