Hi @Tanabe2208! Welcome to the Forums!
The roles are stored in the DefaultGameplayTags by default and switchboard looks for roles in VPRoles.ini. To create VPRoles.ini, go to project settings → Virtual Production → Virtual Production → Roles → Edit → Add New Tag Source. Then type in the file name and press add new source. From there you would configure your tags making sure you are using your new source.
For more information, check the unreal documentation here:
I hope the above solution works for you!