This is most likely because your Thunderbolt dock is not a disk drive, but a dock/hub.
You can try the following sequence to see if this works for you:
1. Verify if the Thunderbolt dock connect/disconnect action in is being detected via the following XQL query:
|dataset = xdr_data|
| filter event_type = DEVICE and event_sub_type = DEVICE_PLUG
| fields action_device_usb_product_nam
If you're able to verify the dock is getting registered as a USB device, proceed to the following steps:
2. Add the Thunderbolt dock serial number/GUID under Policy Management -> Settings -> Device Management.
3. Add the device your Device Configuration Profile under "Custom Device Type" and Action as "Block".
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