Hello,
RDS CAL is compatible with older versions of servers (backward compatibility). For example, you can use RDS 2019 CAL to deploy Windows Server 2016&2019.
For the Windows Server 2022(session host) you are using, the corresponding RDS 2022 CAL is required for deployment at this time.
(Image source: License your RDS deployment with client access licenses (CALs) | Microsoft Learn)
Best regards