2025-05-08T16:58:22.888+0200 78061de006c0 -1 monclient(hunting): handle_auth_bad_method server allowed_methods [2] but i only support [2,1]

Hi folks,

Your help is appreciated. I am currently try9i8ng to learn microceph following the Canonical Documentation.
microceph status shows :

MicroCeph deployment summary:
- trabant (192.168.xxx.xxx)
  Services: mds, mgr, mon, osd
  Disks: 8

next I tried to create a RGW User like that


sudo radosgw-admin user create --uid=user --display-name=user

and I get

2025-05-08T16:58:22.888+0200 78061de006c0 -1 monclient(hunting): handle_auth_bad_method server allowed_methods [2] but i only support [2,1]
failed to fetch mon config (–no-mon-config to skip)


microceph was installed according to the Canonical Documentation on Ubuntu 24.04 LTS `with apt install microceph`

I already searched for a fix , but couldn´t find something useful. Trabant is a physical machine.

What can I try to solve that problem and go further with microceph?
Many Thanks in advance,

Uli