In the polycom template select custom for provisioning server address then input that. Every time you re-save you will have to select internal then custom again or it will switch it from HTTP to TFTP.
Everytime you save it will look like its on TFTP next page load but it will be on http unless you save again. It’s actually a bug I haven’t had time to report. Double check the /tftpboot/ files for that MAC if you want to make sure its working or just try provisioning and see what the phone says.