Hi @ROMANCE,
I'm afraid SAM L2.0 authentication is not support in SharePoint Subscription edition. SAML token-based authentication in SharePoint Server uses the SAML 1.1 protocol and the WS-Federation Passive Requestor Profile (WS-F PRP). Reference here: SAML token-based authentication.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.