So, I keeping getting the same pop-up message in Plex Forums. “You’ve asked questions that now have answers. Make sure you accept/reject the answers.” It then takes me to a page where I supposedly would choose an answer, but they’re both Feature Request posts, so there is no “Answer.” One of them is even closed so I can’t do anything to it anyways.
What should I do?

Well they may be “feature” requests but you posted them as a question. I the future I suggest never using the default “question” option but rather click on the arrow next to “question” and choose “start a discussion” instead.
To “fix” the problem either just pick a response and choose it as an answer or respond to the thread yourself and choose your response as an answer.
For the locked thread you may be able to accept an answer anyway or you can ask a moderator to fix it for you.
The closed thread was already converted into a ‘discussion’.
But the other ‘feature request’ was still a ‘question’. I switched it now as well.