The position needs to be at least 5 ticks wide (5 increments on the official Uniswap v3 UI, which is 0.5% wide) and include the market price and the redemption price. If the position is narrower than 5 ticks, or doesn't include the market price or the redemption price, you will not accrue any rewards. If your position is larger than 5 ticks you will earn less rewards depending on your liquidity concentration.