Do you offer the service type in your listing that the job is advertised as needing? For example "PET BOARDING" jobs - Your listing will need to have the Service type of "PET BOARDING".
What is the error that displays when you go to apply for the job?
Are you waiting on a Police check to be reviewed?
Are you applying using the App or the Website?
If App - do you have the latest App version download from the App Store?
All these things help us get closer to solving why you can't apply for jobs.