When you accept a suggestion, you should get taken to the create quest screen, with the description your ally gave you preloaded. From there, you can save it to officially add it to your quest list. Which of those screens didn’t show up for you?
An error occurred while saving the commentJohn White commented
Just started this week and it's fun and helpful. However, I have similar issues with Ally acceptance. Seem to be in a loop where my Ally request appears active in my HQ but the person shows as an Ally elsewhere. None of their suggestions have have worked - i.e. they disappear when I select Accept. A little disappointing for such a fun app but I'll add this as a quest to conquer my disappointment! ;-).