Welcome to Uniswap v3! Since May 5th 2021, Uniswap v3 was released with a new liquidity pool concept (based on NFT rather than LP UNI-V2 tokens) and several new features.
The Unicrypt farms, however, are still based on Uniswap v2. In order to provide liquidity to a pair for farming (all Unicrypt farms have a link to add liquidity if no LP token was found in your wallet), you will need to add "v2." in front of "info.uniswap.org/pair/0x..."