Yes, Solarisbank supports the Enhanced (Decoupled) SCA flow.
If you cannot find Solarisbank in the list of available configuration IDs, this is expected behaviour.
Solarisbank does not expose a generic Solarisbank configuration ID. Instead, the configuration IDs listed in the documentation correspond to Solarisbank partner brands.
During the Enhanced SCA flow, the configuration_id indicates which Solarisbank partner integration should be used. Based on this parameter, Solarisbank can route the user to the correct partner environment for authentication.
For this reason, you will only see configuration IDs for Solarisbank partners, not a configuration ID for Solarisbank itself. When integrating with the Solarisbank XS2A API, you should use the configuration ID of the relevant Solarisbank partner.