If the guest is only banned and he will attempt to login to the app he will not be able to participate in the loyalty rewards. Example as a test attached below for the guest who is banned from the platform.
When the guest logged into the app he will encountered with a message that the account is banned and he will not able to access the available rewards in my account:
Screenshot from the redeem option where the reward was available on the guest timeline but was not showing any reward in the app as the guest was banned:
If further assistance is required, submit a ticket to Punchh Support. (For help submitting a ticket, click here)