I get this error when trying the module for drupal 11:
Problem 1
- Root composer.json requires drupal/fontyourface dev-3465748-drupal-11-compatibility, it is satisfiable by drupal/fontyourface[dev-3465748-drupal-11-compatibility] from vcs repo (git https://git.drupalcode.org/issue/fontyourface-3465748.git) but drupal/fontyourface[dev-3.x, dev-4.0.x, 3.0.0-alpha1, ..., 3.x-dev (alias of dev-3.x), 4.0.0, 4.0.x-dev (alias of dev-4.0.x)] from composer repo (https://packages.drupal.org/8) has higher repository priority. The packages from the higher priority repository do not match your constraint and are therefore not installable. That repository is canonical so the lower priority repo's packages are not installable. See https://getcomposer.org/repoprio for details and assistance.