Sending from shared mailbox from secondary domain is not working

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We have 2 domains in Office365 registerd (for example A and B)

User A in domain A if full user with mailbox and licence Business Premium

User B in domain B is shared mailbox

User A has full control and send as and send on behalve on mailbox B

When we connect to outlook with user A and send a mail from the sharedbox B we recieve the error Not allowed.

 

The second option is disable auto assign to outlook.

Create new profile with user A

Add manual via advanced settings mailbox B

Send mail from mailbox B and same error, Not allowed.

 

Any sugestion to solve this problem??

When we create a mailbox in domain A and shared mailbox in domain A not problem.

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