TL;DR Should you offer a reward for each time they sit on the potty, or just when they wee and poo? Can you mix rewards? i.e. YouTube to sit on potty but sticker/chocolate only if you do a wee or a poo?
Should the sticker go on the potty for a two year old? At 26 months is he too young for a sticker chart?
Some background: We had a disastrous attempt to potty train our two year old using the Oh Crap Potty Training method in November. We spent two weeks at the first stage, had no wees in the potty during this time and only poos on the first day, and our toddlers resistance got progressively worse until he was point blank refusing to even go near the potty and getting more and more agitated. This behaviour was the same at nursery who were supportive of our efforts.
While we have abandoned our efforts to potty train for the time being/until it gets a bit warmer, he does have some nappy off time each day at his own instigation and have left the potties out. In fact we had initiated potty training in the first place due to nappy refusal. While he will occasionally chose to sit on the potty he has never wee'd or pooed on it.
Last night during nappy off time he needed a wee, and started weeing on the floor. I quickly, as per Oh Crap Potty Training instructions, grabbed him and sat him on the potty. He stopped mid-flow and refused to do the rest of his wee on the potty. Got up, and started to do a wee on the floor a couple of feet from the potty. This occurred FOUR TIMES. He even refused to wee standing up into the potty as I tried to catch some of his wee. He thought the whole thing was hilarious.
I was on a Zoom call with my parents at the time, who while not the authority on everything, have potty trained three of us, helped with the potty training of nieces and nephews and have experience working in early years education. They said that it was the first time they had ever seen a child be able to stop mid-stream like that. FWIW he was able to hold it for 5-6 hours when we were doing Oh Crap Potty Training.
We can often get him to sit on the potty by giving him a phone with YouTube videos of things he likes on it and he occasionally sits on the potty of his own violation particularly if we are going to the loo at the same time, but that won't make him wee or poo!