I just did a clean install of your "JA Sport for Joomla 4". Once installation was finished, I received the following error when attempting to access the front end ggfund.org and the back end ggfund.org/administrator:
An error has occurred.
0 Class 'Joomla\Plugin\System\Webauthn\CredentialRepository' not found
I was unable to find anything useful on the Internet regarding this problem.