Sign-in with your e-INFRA CZ account or an IT4Innovations account.
For e-INFRA CZ users: Use your einfra password. Do not use your eduid.cz account/password, your home organization account/password, etc, these accounts are not recognized by this application. To reset/change your einfra password, go to https://profile.e-infra.cz/profile/settings/passwordReset and reset/change password in einfra namespace.