Must call get_signature first

I'm trying to use Oculus Avatar SDK on the Oculus Quest 2 with Unity. When I try to get the Platform User ID, I get the following error:

"Must call get_signature first"

I cannot find in the documentation what is the proper way to configure it in order to be able to make use of this ID.

Also manually change the Avatar ID to the ones provided for testing doesn't seem to have any effect on the avatar.