Having the same issues. The first time I actually click on the button to start “Count links” it began but then it stopped. Tried to run it again and nothing was coming up.
Then it told me might of had a database duplicate or transient problem that might go away.
The database issue seemed to go away but I click to count links and its stuck again in 0 and the bar doesn’t move.
JS Console outputs this:
GET https://www.example.com/wp-json/yoast/v1/reindex_posts 500 ()
(anonymous) @ VM587:1
send @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.8:4
ajax @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.8:4
e @ wp-seo-reindex-links-501.min.js?ver=5.0.1:1
(anonymous) @ wp-seo-reindex-links-501.min.js?ver=5.0.1:1
f @ wp-seo-reindex-links-501.min.js?ver=5.0.1:1
h @ wp-seo-reindex-links-501.min.js?ver=5.0.1:1
(anonymous) @ wp-seo-reindex-links-501.min.js?ver=5.0.1:1
dispatch @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.8:3
r.handle @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.8:3
trigger @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.8:3
a.event.trigger @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.8:9
(anonymous) @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.8:3
each @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.8:2
each @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.8:2
trigger @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.8:3
n.fn.(anonymous function) @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.8:4
i @ wp-seo-reindex-links-501.min.js?ver=5.0.1:1
dispatch @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.8:3
r.handle @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.8:3