neowin[.]net/guides/want-to-remove-the-windows-11-system-requirements-not-met-watermark-here039s-how/
I checked my mini-PC, which doesn't meet the requirements by a long shot, & nothing there [so far], but if it might apply to you in the future, might want to bookmark or save the URL for the article, as it gives the registry entry to make the watermark with the warning go away.