Does AWS Workspaces support TPM or Secure Boot?

Windows Server 2019 does not support TPM. There is no additional action that can be done at user end to enable this, as its AWS Managed. However, for the requirement for Trusted Platform Module(TPM) and secure boot, you may explore this feature with Amazon Workspaces on Windows Server 2022. Please take a look into this new offering that was introduced: https://aws.amazon.com/about-aws/whats-new/2023/10/amazon-workspaces-windows-server-2022-bundles/