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As I understand, you want to delegate access permissions on Inbox foler of one user account that has been hidden from global address list.
Yes, for this situation, you can refer to steps below to configure delegation permission on source mailbox. And then, ask the customer to access the shared Inbox folder by clicking "Open --> Other User's Folder" and typing the full smtp address of source user account.
Allow someone else to manage your mail and calendar
Didn't work. Typing in the SMTP address does not allow you to bring up the Inbox (presumably because its hidden from the GAL.)
Have you granted shared permission on that mailbox hidden from GAL to users?
To narrow down this issue, please post back the following information to allow us to understand the problem in more details.
1. Connect Windows Powershell to Exchange Online.
2. Run the cmdlet below to list the permissions configured on the source mailbox.
3. Post a screenshot of error when you failed to open the Inbox folder from outlook.
Any update of your problem? If you need additional assistance on this problem, feel free to let us know.