There are two ways to use Google Appointment Slots without a Google account. The first way is to create a new account and then use that account to sign in to your existing appointment slots.
The second way is to use a guest account. Guest accounts are used when you’re not the person who created the appointment slots, or when you don’t want to share your personal information.
When you create a new account and sign in, you’ll see all of your existing appointment slots. To use a guest account, first create a new appointment slot, and then sign in using the guest account.
When you’re signed in, the guest account will have limited access to your appointment slots, but it will be able to view and edit them.