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Host jump.ecmwf.int a?-* a??-* hpc-* hpc2020-* ecs-*
  User ecmwfusername 
   IdentityFile ~/.tsh/keys/jump.ecmwf.int/user.address@somewhere.com
  CertificateFile ~/.tsh/keys/jump.ecmwf.int/user.address@somewhere.com-ssh/jump.ecmwf.int-cert.pub
  HostKeyAlgorithms +ssh-rsa*,rsa-sha2-512
  PubkeyAcceptedKeyTypes +ssh-rsa*
  ServerAliveInterval 60
  TCPKeepAlive yes

Host a?-* a??-* hpc-* hpc2020-* ecs-*
  ProxyJump jump.ecmwf.int

You can find the right values for those two parameters in the output of the tsh command:

% tsh login
> Profile URL: https://jump.ecmwf.int:443
Logged in as: user.address@somewhere.com
Cluster: jump.ecmwf.int
Roles: 
Logins: ecmwfusername
Kubernetes: disabled
Valid until: 2022-12-13 20:54:18 +0000 GMT [valid for 3h56m0s]
Extensions: permit-X11-forwarding, permit-agent-forwarding, permit-port-forwarding, permit-pty  

If you are using Visual Studio Code with the Remote SSH extension, it will not recognise hosts with wildcards as defined in the previous SSH config file.

You may add append an explicit entry for the desired hosts in your ssh config file:

Host ecs-login hpc-login