No certificates when trying to add SSL Bindings for Azure Web App -

i trying create ssl binding azure web app host api app.

after navigating "custom domains , ssl" web app in question, have added custom domain name "admin.api.foo.com" , uploaded pfx wildcard certificate (*.foo.com) , displays in list in "certificates" section.

i think next step create ssl binding. go "ssl bindings" section , can select hostname "admin.api.foo.com" drop down in dropdown certificate there 1 option "choose certificate". why doesn't wildcard cert show in drop down?

the problem was trying register subdomain of subdomain.

instead of using admin.api.foo.com started using adminapi.foo.com. started showing in drop down.