Agile testing teams face various challenges, including keeping up with changing requirements, not planning cross-browser testing, failing to incorporate automation, excessive focus on scrum velocity, lack of a strategic agile testing plan, considering agile a process instead of a framework, micromanaging agile testing teams, incoherency in defining 'done', aiming for perfection by detailing an agile testing plan, mishandling carry over work, lacking skills and experience with agile methods, test flakiness, technical debt, and compromised estimations. Overcoming these challenges can significantly improve the success of sprints in agile testing.