Event ID 1057: RD Session Host cannot create its self-signed RDP certificate
Event ID 1057 means the Session Host could not build its RDP certificate, so TLS handshakes fail. Clear the stale certificate store and restart the service.
0x80090331 algorithm mismatch: legacy TLS blocks Exchange from Microsoft 365
0x80090331 means no shared cipher or protocol is left between the two servers. Learn why old builds fail TLS 1.2 and what the supported path is.