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SSH clients that have been updated since the CVE-2023-48795 (about two weeks ago) cannot connect to Odoo.sh using RSA keys with the new default SSH options.
A workaround is to use the following ssh client option:
-oPubkeyAcceptedKeyTypes=+ssh-rsa
However this option actually bypasses the latest security patch made on openssh clients, so this option is considered insecure and should be seen as a temporary workaround. A better alternative would be to switch to the newer and safer ED25519 key types.