Everytime I challenge someone in sololearn either expires or not accepted by opponent. Don't know why?

Question

as a result I am gaining xp's at low rate

Answer 1

Obviously must to be opponents which dont want to be challenge

Answer 2

Try to check your opponent Page Feed to find out if they are active in challenge or not. Anyway I believe the time was not wasted as you still learn from the quiz, unless you're a 100/100 scorer.

Answer 3

https://www.sololearn.com/discuss/553469/?ref=app