EGI Check-in supports dynamic registration, but dynamically registered clients will not have any scopes. Therefore, users have to either register a client manually or use a preregistered public client (recommended).
You will need to follow the OIDC-flow, which usually involves authentication in a web-browser. If the browser does not start, you can copy paste the displayed URL.
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[...]
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Generating account configuration ...
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accepted
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To continue and approve the registered client visit the following URL in a Browser of your choice:
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https://[...]
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[...]
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Polling oidc-agent to get the generated account configuration .....success
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The generated account config was successfully added to oidc-agent. You don't have to run oidc-add.
Copied!
Finally, you will be be asked for a password on the commandline to safely store your credentials.
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Enter encryption password for account configuration '<shortname>':
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Confirm encryption Password:
Copied!
Note: You need to run the webbrowser on the same host as the oidc-gen command.
If you operate on a remote machine, you need to use the device code flow, by adding --flow=device to the above commandline.
Advanced users may succeed by otherwise ensuring that the browser you are using can connect to the host on which oidc-gen and oidc-agent run on ports 4242, 8080 or 43985.