11 files declare their use of OneTimeAuthentication

OneTimeAuthenticationTest.php in core/modules/user/tests/src/Kernel/OneTimeAuthenticationTest.php
ServerCommand.php in core/lib/Drupal/Core/Command/ServerCommand.php
TestSiteUserLoginCommand.php in core/tests/Drupal/TestSite/Commands/TestSiteUserLoginCommand.php
UiHelperTrait.php in core/tests/Drupal/Tests/UiHelperTrait.php
user.module in core/modules/user/user.module
UserCancelTest.php in core/modules/user/tests/src/Functional/UserCancelTest.php
UserController.php in core/modules/user/src/Controller/UserController.php
UserHooks.php in core/modules/user/src/Hook/UserHooks.php
UserPasswordResetTest.php in core/modules/user/tests/src/Functional/UserPasswordResetTest.php
UserRegistrationTest.php in core/modules/user/tests/src/Functional/UserRegistrationTest.php
UserTokenReplaceTest.php in core/modules/user/tests/src/Functional/UserTokenReplaceTest.php

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