Hey, thanks for the reply,
Indeed after digging around a bit I found a way where it seems possible to set the signing secret.
I haven’t managed to find a way to set via the dashboard however the Management Api docs offer an endpoint to achieve this: https://auth0.com/docs/api/management/v2#!/Resource_Servers/patch_resource_servers_by_id
It seems Resource Server is the Management Apis terminology for an API.
You can patch the signing secret using this endpoint though and set the algorithm to be used as well.
I haven’t managed to test this properly yet as I’m having a few issues with my Management Api access_token but this seems to be the way to do it.