Add new UPN suffix to Entra Connect

Hi,

Let's say I added a new alternate UPN suffix into the AD Trust, like mydomainB.com.

Then I also added UPN under Office 365 Settings - domain. And I did the verification with TXT record.

My question is: for this new UPN suffix, do you need to run Entra Connect tool again and sync it again or will it automatically see it?

please clarify

thanks,