New users should get UPN suffix @tailspintoys.com by default after the custom domain is verified. What should admin set?
Select an answer to reveal the explanation.
Short Explanation and Infographic
Default domain steers new UPN suffixes. Set tailspintoys.com default after verify — simple.
Full explanation below image
Full Explanation
Correct Answer — A
The default domain influences default UPN/email domain selection for new users in Microsoft 365.
Why B is wrong: onmicrosoft.com has platform roles; careless deletion is dangerous/not the default-domain control.
Why C is wrong: Theme is visual.
Why D is wrong: Opposite of onboarding needs.
Exam tip: Default UPN domain → set default domain.