linking calendar on website- for client to schedule do they have to be set up in the portal

I am trying to make it so that I can put the link to my schedule on my wesbsite, which I have done, so that a potential new client can schedule with me. I don’t want to have to create a portal for them each time. I want the client to find my website click the calendar link and be able to schedule with me. The client portal log in pops up and when they click to have a link sent to them nothing gets sent. From what I have read I think it’s because the are not in my client database. I want the client to be able to schedule with me even if they are not in my database, otherwise being linked to my website doesn’t help me- they would still have to contact me as new clients and I dont’ want that hassle with every new person