Hi Ayanda,
I am Sumit here to assist you with this question.
Insider Builds always have a watermark. This is by design and does not affect activation in any way.
The watermark was always there in Windows 10 Beta Builds. It was not there in Windows 11 Builds because it was essentially the same as stable channel 22000.
Rest assured no action is required from your end.
From the Windows Engineering Team: