If you have turned off your availability, users cannot schedule time with you. They can only send you a message or a question and they see on your profile when you will return.

If your availability is turned on but someone tries to contact you during a time where you are not available (you can fill in the all-day section the times and dates you wish to be available), then users will be presented with an option to schedule a time with you depending your availability and will be able to send you a calendar invite.

You need to have allowed the other user to schedule time with you first by going to your $ window in the chat and enabling this user to schedule time with you.

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