Failed to login SharePoint 2019 site via UPN with a one-way trust domain

[GuangHui Wang]

Dear Sirs,

We have two domains:

AAA.local

BBB.local

And there is a one-way trust relation: AAA trust BBB

Our SharePoint Server 2019 hosted on domain AAA.local, 

• Users from both domains can sign in by: Domain\User
• Users form AAA can sign in by User Principal Name
• But users from BBB can not sign in by User Principal Name, why?

Can anyone help? Many thanks.

[#2]

@GuangHui Wang Have you ever found a solution for this issue? We have exactly the same issue.

[#3]

@GuangHui Wang  permission granted from people picker already ?