Tailscale cert on Synology DSM 6

I’ve got two Synology NAS units, one of which is DSM 7 and the other is DSM 6. The “tailscale cert” command works fine on both to create the certs. When I add the cert on DSM 7, it loads in fine, but doing the same on DSM 6 gives me an error “DSM does not support ECC certificates”. Obviously DSM 7 does support ECC certs but somehow DSM 6 doesn’t. Anyone find a workaround?

Unfortunately I don’t think there is a way to force tailscale to issue RSA certificates.