Airbnb is no longer supporting co-hosting through the Webready connections.
Airbnb advises that you log into Airbnb and switch to Hosting Team.
What’s the difference between a co-host and hosting team?
There are two ways to get extra support hosting on Airbnb: hosting teams and co-hosts. A hosting team usually manages a listing owner’s place, their guests, and their online listing. It may be a business or team of people that you have a legal contract with. A co-host is often a friend or family member acting alone.
To help you choose, here are the differences between co-hosts and hosting teams:
https://www.airbnb.com/help/article/2680/whats-the-difference-between-a-cohost-and-hosting-team
If switching to Hosting Teams is not possible, don't worry! With Webready you can either connect the main host Airbnb account or use iCal urls to connect your listings to Webready and Airbnb.