This is a common question and one we’re happy to break down for you here. Essentially, there is one main reason as to why your trade might fail on the Tap app. Below we’ve outlined what has happened, what it looks like, and how to resolve the issue.
The main reason that a trade might fail is that the amount you would like to buy is below the minimum purchase amount. For example, if you open a trade to buy Ethereum you will need to check the minimum amount buyable indicated in blue text below the ETH purchase amount (here in grey text), and ensure that the amount you want to buy is over this limit. The Confirm Trade box will remain grey until the minimum purchase amount is met or above.