My forum topics are not getting indexed forum link
Though I sucessfuly was able to submit my forum sitemap too,but google is not indexing the topics.Please have a look to confirm everything is good from forums end.
Did you have the yoast plugin installed.?
if yes check excludes link in yoast
All is ok with your forum SEO. You don't need any other plugins. You just need to correctly manage your website Google Webmaster tools: https://www.google.com/webmasters/
Register and open property for your website. Then put your forum sitemap in Google to let it start indexing. Your forum sitemap URL is this: https://thespherical.com/community/sitemap.xml
BTW, your forum is already being indexed by google, i just searched one phrase and got results:
the second result in Martin's screenshot goes to a topic, so your topics are being indexed for sure. You just need to wait for more indexing or your website has other issues. I can say that the forum part is ok, and the forum SEO data work fine. So there is no any issue that can be solved from our side.
Duplicate, submitted URL not selected as canonical for https://thespherical.com/community/qa/
Just ignore that. This doesn't have any serious impact to your forum SEO.