This is for Office 365 as target
You migrate a user and this user has multiple Notes users have the following ACL on the mail database.
ACCESS: Reader
These ACLs are added by using Domino Administrator and not end-user Notes Client.
After the migration, Outlook | Inbox folder level permission migrated as NONE.
1- Find the migrated user manually in Office 365 control panel
2- Go to Mailbox Delegation section
3- Delete the names you see under Send on behalf and Full Access and Save. Keep the service account name if you see it.
4- Create an Outlook profile for the migrated user
5- Verify the deleted names are matching you did at #3
6- Upgrade to NME 4.8.1.23. Please feel free to contact Support to request that release
7- After the upgrade, please reset the current Admin Pool accounts under Exchange Server settings
8- Create new Admin Pool accounts
9- Perform a new migration