Can't set up Netflix Kids
If you can’t select Kids Profile in Viewing Restrictions,
The profile may be set to allow shows and movies with a higher maturity rating level than the Netflix Kids experience.
To use the Netflix Kids experience for that profile, select a lower maturity level.
If you select a maturity level higher than the kids level for your region, the profile won't show the Netflix Kids experience.
You may have an extra member account with only 1 profile, and it can't be a Netflix Kids profile.