My apple watch series 8 keep locking while I am wearing it - wrist detection is ON.

If the watch uses light as part of the sensing it is very possible a new model might use a different wavelength (color) which reacts differently with your tattoo.

Suggestion: For the purpose of testing try wearing on the other wrist, or even on the underside of a wrist. The aim is simply to see if you can prove it is something like your tattoo interfering.

Are your wearing the watch properly?

Wearing your Apple Watch - Apple Support

Your best option may be to make an appointment at the Genius Bar in an Apple Store near you and let them look at it. If that is not possible, use the online Apple Support option. Either way they have advance diagnostics they can run:

Genius Bar Reservation and Apple Support Options - Apple

I almost broke my head with this problem.. Do you have a wrist tattoo?

Fdrddcczzr wrote:

Please stop all activities on my Apple Watch and also disconnect me

No one here can do anything on your Apple Watch. No one here works for Apple. This is a user to user only forum.

That is a good point that I didn't think of.

JReckrodt wrote:

I do! Hmmm

Apple specifically suggests tattoos can interfere with the normal operation of Apple Watch.

Newer sensors are likely more sensitive over previous models.

or maybe you didnt put te band tight enough and it sometimes doesnt touch your wrist

nvm

Please stop all activities on my Apple Watch and also disconnect me