Confused on weight loss scale

How did you determine the 1200 calories even for Keto? In general losing 2 lbs a week falls under people who have large amounts of weight to lose. LIke 75 or more pounds. And the less weight one is trying to lose then the weekly amount becomes less.
So here in MFP if you put in your height, age, weight it will give a daily
calorie amount, and you can indicate what you want to lose per week. Starting I think at .25 maybe .5lb and going up to 2 lbs per week. But that 2 lbs per week is aggressive depending on how much one has to lose.

Ok for what you are coming up for 1200 calories on Keto with your splits
1200 x 20% for protein equals 240 calories divide that by 4. Soyou should be getting 60 grams of protein daily. For Fat same thing but divide by 9 as fat has more calories. So would be 100 grams
But for your carbs even at 5% should be 15. Is that net carbs or not net? Becasue even with KETO or low carb, what makes one lose weight is the reduction in calories we eat.

MFP will not give you calories below 1200/day, as it's generally agreed that going below that is unhealthy unless you're under medical supervision.

How much a person can lose per week starts with how much energy they use on a daily basis. Everyone uses energy and how much depends on gender, height, weight, age and activity level. On average, with everything else being the same: men use more energy than women, taller more than shorter, younger more than older and heavier more than lighter. Even if you sit on the couch all day, moving only a bare minimum amount during the day, your body would still use energy for bodily functions like breathing, food digestion, heart beating, etc.

Personally I am 45, 146ish, female and pretty inactive without intentional exercise. I burn about 1550-1650 calories per day. So if I were to put a goal of 1-2 pounds into MFP, I would get an intake goal of 1200 calories (because MFP won't recommend lower) but would not realistically expect to lose 1-2 pounds per week. For me to eat 1050-1150 daily (1 pound average loss rate) or 550-650 calories per day (2 pound loss rate) would not be a safe or sustainable food goal.

One alternative is to exercise more. Keep in mind that intense exercise and/or putting a good deal of time daily into exercise could mean you need to increase your intake. If I were to walk 15 minutes a day I should still be ok at 1300-1400 intake (my goal for .5 pounds per week loss rate). But if I were to run 60-90 minutes a few times a week, I could burn a great deal more calories but would also need to eat perhaps 250-300 more daily to not feel fatigued and drained.