OneKEY | The key keeps flashing yellow after interacting with a lock and it won't allow me to operate another lock.

The key is most likely in "Restricted Mode".  Go to LIVE Access and check the user profile.  You can select "Yes" or "No" under restricted mode.  If that field is grayed out, go to Settings / Restricted Mode and make sure it is enabled if you want to be able this function for users.