My fiance has an interview date! It's at the end of February!
We've had such trouble with this scheduling stage and I had been unable to find anything helpful on the internet or on this forum, so I want to leave my experience here for anyone else who may go through it.
My fiance is Russian and our case was originally sent to Warsaw. We transferred our case to Jerusalem and at the end of September we finally got the email saying the embassy received our documents and they were ready for us to schedule the interview by going to https://ais.usvisa-info.com/en-il/iv/users/sign_in. When we first tried to schedule, there were no appointments and you can't pay your fee if there isn't an appointment. After a week or two, finally they released appointment dates. When you are ready to pay you get sent to the Hyp CreditGuard page when you put in your card info and pay. However, every time we tried, we got a message saying "Payment Failed! Refusal. Use alternative method." We tried multiple cards but nothing worked. We also received a message after several tries that said "There was a problem processing your payment. You may have been charged. Please contact support. Do not attempt to pay again." They listed a contact page (https://ais.usvisa-info.com/en-il/iv/information/contact_us) with an email for payment issues, which I emailed. Absolutely useless. In one reply they did confirm that my payment hadn't gone through, but all other communications were copy-and-paste pre-written messages that didn't relate to anything I wrote. All of the appointments were taken in less than 24 hours and we missed the opportunity.
I saw there is an option to pay in cash at the Israeli Postal Bank, but you have to physically go there and pay, then you come back to the portal and upload a receipt before the system considers it paid, then it will let you through to the scheduling calendar. Neither of us are in Israel right now, so that wasn't an option for us.
Then the war in Gaza started and they announced they were no longer processing visas and cancelling appointments. We've checked several times per day every day anyway and only twice during October and November did any appointments appear. I suspect they were cancellations because they were only a week or two away from the date I saw them. We tried to pay anyway, but no luck. I emailed the visa section of the embassy and asked if they had any plans to restart visa appointments again and they told me they may release new dates in January and we should keep checking the portal.
At this point I discovered that you can schedule by phone too. I don't know how I missed this earlier, but I called and confirmed that they can take your credit card over the phone and then schedule you. There were no dates at that time, so they told me to keep checking the portal.
Finally in the beginning of December at least one February appointment appeared (before you pay, the portal will only tell you the soonest appointment available. There may be other dates but you can't see them or know how many until after you pay). This time I had a new card. All previous attempts had been with Mastercards, but my new card was a Visa card. This time it worked! No issues at all! I don't know if being Mastercard was the problem or not, but there is nothing that says they don't accept them. There were three spots available and we chose end of February. It's good we didn't take an earlier date in February due to the medical exam. After scheduling the visa appointment, we scheduled the medical exam. All of the December, January and early February dates had been filled up, so the mid February date worked well for us.
I want to celebrate, but I know there are still big hurdles to overcome yet. My fiance will have to enter Israel and it seems their border control is as strict and hard to cross as the US border control. The embassy could also put him in administrative processing. And then there's possible escalation of the war and it's complications. So I'm (very) cautiously optimistic.