Which phone are you using? Was it one of the device they listed here?https://www.koodomobile.com/en/help/volte-koodo-prepaid 

As well, which roaming carrier you were on? Did data and text work?

iPhone 12 Pro

T-Mobile, data and text working but calls are not.

After rebooting multiple times, I still get the message that I need to contact Koodo in order to flip the VoLTE switch to ON.

Have you tried following these steps? https://www.koodomobile.com/en/help/volte-koodo-prepaid

Yep - that’s what’s failing. Step 5 “Select LTE, VoLTE on” results in the error: “Cannot activate LTE calls. To enable LTE calls on this account, contact Koodo”.

My understanding is that this is because the VoLTE profile hasn’t made it to my line yet, so I’m curious as to how I can make that happen.

That will require a rep. You can download an app that can make or receive calls, such as Fongo, and schedule a callback to that number. https://widget.telus.tiia.ai/koodoprepaid/koodoprepaid.html

Thanks! I was able to talk to a rep this morning and they reset my voicemail PIN, which turned on VoLTE.

That’s great!