The visa appointment calendar is dependent on the number of applicants in the profile AND also the visa type of those applicants.
Use Case 1: Multiple applicants in the account - all same visa type
Lets say you have 2 dependents in the application and 1 primary applicant, total of 3 applicants in the account. To show slots availability in your account there has to be at least 3 slots available. In the below screenshot of 1-applicant account, you will not see the red circled slots because they have less than 3 availability per slot.
Let's say your account has 1 H-1B visa and 1 H-4 visa applicant. To show slots availabilty in your account there has to be 1 H-1B appointment AND 1 H-4 appointment available on the SAME DATE AND TIME.
Example: From the below calendar availability of 2 INDIVIDUAL accounts, YOUR account with TWO applicants will show ONLY one slot available which will be Feb 4, 2024 4 PM (1).