On prem delegate cannot "send as" migrate user

mara2021 811 Reputation points

We have a hybrid deployment. We migrated a user to Exchange Online. We have an on prem user that is a delegate on numerous mailboxes (on prem) including the migrated user. After the user was migrated, in Exchange Online, I gave the on prem user "send as, full access, and send on behalf" permissions to the migrated user. The on prem user cannot "send as" the migrated user. Isn't this the correct way to do this? Thanks for your help.

Microsoft Exchange Hybrid Management
Microsoft Exchange Hybrid Management
Microsoft Exchange: Microsoft messaging and collaboration software.Hybrid Management: Organizing, handling, directing or controlling hybrid deployments.
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