You have 2 types of receivers:
-Roger direct which is built in the Marvel/paradise/Lumity platforms, built in the chip!
-“Normal” Roger receiver (they should come with license inside), picture below:
Previously you will need the roger receiver with licenses to use roger On; But now, you can just get the roger On iN and transfer the licenses to hearing aids.
A bit confusing, so no worries, but ultimately, if you get the Roger On iN, you will not have any trouble and spare yourself a headache, and and you don’t need an audiologist to set the roger On iN for you, you can do it yourself, just follow the video or ask here once you get the roger On iN.
To find an audiologist, you will have to check around you and see what people say, maybe someone in here can give you details of good audiologist near you.
I am not in the state, this is a worldwide forum, so people around the world are posting here, so expect some delay in answering you and expect to chat with people from far and wide, not sure about the Moon and Antarctica!
I hope this helps, but don’t worry too much about roger receiver, and get the Roger On iN, and that’s what I’ve done, no hassle.