In the last update , was Changed: Sitemap pinging links, where re they in the dashboard?
You have nothing to do with the ping links. This is not the sitemap link.
The ping links work internally. wpForo calls them when a new content is added in the forum. wpForo calls that links to notify Google and Bing to re-index the sitemap.
If you just need the sitemap link, you can find it in the wpForo > Boards admin page.
The doc: https://wpforo.com/docs/wpforo-v2/settings/wpforo-seo/#enable-forums-topics-and-members-sitemap
except
one small example is this one
http://blogmatcher.com/u.php
http://www.blogsnow.com/ping
http://ping.bloggers.jp/rpc/
http://www.blogshares.com/rpc.php
http://www.mod-pubsub.org/kn_apps/blogchatter/ping.php
http://rpc.blogrolling.com/pinger/
http://ping.cocolog-nifty.com/xmlrpc
http://ping.exblog.jp/xmlrpc
http://rpc.icerocket.com:10080/
http://api.moreover.com/RPC2
http://mod-pubsub.org/kn_apps/blogchatt
http://www.newsisfree.com/xmlrpctest.php
http://www.a2b.cc/setloc/bp.a2b
http://www.newsisfree.com/RPCCloud
http://ping.myblog.jp
http://www.popdex.com/addsite.php
http://www.blogroots.com/tb_populi.blog?id=1
http://www.bitacoles.net/ping.php
http://xping.pubsub.com/ping/
http://ping.rootblog.com/rpc.php
http://api.feedster.com/ping
http://ping.blo.gs/
http://www.weblogues.com/RPC/
http://trackback.bakeinu.jp/bakeping.php
http://www.blogstreet.com/xrbin/xmlrpc.cgi
http://www.lasermemory.com/lsrpc/
http://rpc.icerocket.com:10080/
http://rpc.newsgator.com/
http://ping.syndic8.com/xmlrpc.php
http://www.blogdigger.com/RPC2
http://1470.net/api/ping
http://pingoat.com/goat/RPC2
http://rpc.technorati.com/rpc/ping
http://rpc.blogbuzzmachine.com/RPC2
http://blogsearch.google.com/ping/RPC2
http://ping.blogmura.jp/rpc/
http://api.my.yahoo.com/rss/ping
http://rpc.copygator.com/ping/
http://ping.weblogalot.com/rpc.php
http://www.blogpeople.net/servlet/weblogUpdates
yandex.ru ? indexnow?