OpensSSH certificate for authentication

Hi, i have some strange things during connection via ssh gateway

Linux RDM 2026.2.1.4 does not use OpenSSH user certificates during authentication.
OpenSSH successfully authenticates using:
id_tpamssh + id_tpamssh.pub
(ecdsa-sha2-nistp256-cert-v01@openssh.com)
RDM loads the private key successfully but only offers ecdsa-sha2-nistp256 instead of ecdsa-sha2-nistp256-cert-v01@openssh.com.
SSH debug log confirms that the certificate is never offered, while OpenSSH offers ECDSA-CERT and authenticates successfully.

For example:
RDM:

Successfully loaded key: ...
Starting public key authentication
Validating public key: ecdsa-sha2-nistp256
Key is not accepted by server

OpenSSH:

Offering public key: ... ECDSA-CERT ...
Server accepts key: ... ECDSA-CERT ...
Authenticated using "publickey".

Can you please help me with this problem?