@Delphine714
There are 3 designations for Listings:
Listing Owner
Co-Host
(Primary Host)
Sometimes Listing Owners will name a Co-host as primary host on a listing. The owner will be displayed as a "co-host" on the listing to guests, but always retains ownership of the listing. The Co-Host will show as "Host" to guests if the owner selects them to be primary host on a listing.
The key is to establish a new listing with yourself as owner. Then invite someone as a Co-host and have them accept. Be sure you have added their payout information as Co-host. Once that is done the owner can then name the co host as Primary Host on the listing if they wish. Co-Hosts identity must be verified, before they can be added as Co-Hosts to a listing. I usually suggest the Co Host setup their profile and default payment FIRST. Then when Airbnb has confirmed verification of their ID and bank account information, the Listing Owner can send them an invite to Co Host.
Be sure you send the invite to the email that is listed on the Co-Host's Airbnb profile. It is best to do this on a desktop/laptop computer and not on your phone. Same with the Co-Host accepting the invite. Click the email invite on your desktop/laptop and not on your phone email. Using a phone can cause authentication issues depending on the security of the network.
Add Co Hosts to Your Listing
https://www.airbnb.com/help/article/1244
Listing Owner/Co Hosts/Primary Hosts
https://www.airbnb.com/help/article/1536