Hola.
I just installed the Darktable nightly build 20251206 version on Windows 11 Home Edition and had no problems adding the watermark.
What specific problem are you experiencing? Which version of darktable are you using? What operating system are you using?
I do not often use watermark. But these have potential for many uses. Thank you @difrkaguilar. Salute with a shot of Rum to you. Too bad can not get Cuban Rum or Cigar here in US.
