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There have been no major issues lately. You area allowed to answer up to 80 questions/day as a Level 2 user. You cannot post an answer to a question posted by someone who has you blocked OR if you're trying to answer older (years) questions. Make sure you're looking at the "Answer" tab at the top of the question list, not the "Discover" tab, as those tend to be older questions and are often closed to new answers.
Daniel
You may have Reached your Daily Limit for the Day you may have to Come Back the Next Day to Answer more Questions
Peter Boiter Woods
What happens when you try? If on a mobile, switch to desktop mode.
Anonymous
Maybe you hit your daily limit of 80 answers
?
You are level 2.