This lead me to the solution:
https://forums.iis.net/t/1152122.aspx?HTTP+1+1+405+Method+Not+Allowed+Allow+OPTIONS+TRACE+GET+HEAD
I simply added a trailing slash on my method name. I have the Endpoint set to the xxx.svc. Then I had the Resource set to a value such as /Resource1. By changing it to /Resource1/ it worked.
The above link suggests that it tries to read the directory or something.
Neal