Ever since the December 2025 update, most complications on my customized watch face through WatchMaker app do not work. The WatchMaker app company said to contact samsung.
II use and s23 Ultra and my watches are Galaxy Smartwatch 6 and 8
WatchMaker is a third party app and Androidslide (the apparent dev, based on a cursory play store search,) is responsible for development of their app, not Samsung.
While I am not aware of any such news, it is possible that Samsung has somehow restricted third party access to complications. If you believe this is the case, you can contact Samsung by visiting the support tab in this app and navigating to "Send Feedback."
