If I use wildcard certificates generated by a 3rd party, such as *.kaikai.com (bought from Go Daddy)
adfs web application is https://testserver1.kaikai.com
https://testserver2.kaikai.com
adfs server is https://adfsresource.kaikai.com/adfs/ls/
it is ok use this certificate for these server.
It should work fine for SSL. A few of the vendors I integrate with do this with no problem.
I'm not sure if I'd use that for token signing though. I don't see why it wouldn't work but it seems a little weird.