2-digit star codes

Trying to get a Polycom SoundPoint IP 331 phone to work with the Grandstream UCM6104 PBX. Almost there, but I can't get the 2-digit star codes to work when the phone is OFF the hook (e.g. when dialing on speaker).

For example, to get voicemail, we have to dial *98. I have tried adding *98, *9x, and *xx to the digitmap, but none of them work.

Here's my digitmap. Can someone help spot the conflict?

[2-9]11|0T|011xxx.T|[0-1][2-9]xxxxxxxxx|[2-9]xxxxxxxxx|[1-8]xx|*xx