“page not found” on players, matches and teams

Hello,

as discussed and unfortunately closed in https://www.ads-software.com/support/topic/page-not-when-click-on-a-player-name/, I get a 404 on clicking match, player or team links.
On test environment everything’s ok, but live it’s not, indeed. It appears on links with and without umlauts.

I also have opened a support ticket about another issue last week, but have no comment on that for now. How do I get best support for this plugin?

Thank you!

The page I need help with: [log in to see the link]