Why "Specifying an Address" for a Normal Mailbox fails
If you put your own email address into the Mailbox Address field of a normal mailbox, the action may still work, but it changes the logic:
Blank Field: Uses the "Primary" mailbox protocol (most stable).
Entered Address: The connector treats it as an attempt to access a different mailbox. If you enter your own email, it usually works, but it's redundant. If you enter another user's normal mailbox address, it will fail unless you have specific Delegate Permissions (which is different from Shared Mailbox permissions).
Correcting your Checklist
Your steps are solid, but keep these two nuances in mind:
Folder Paths: For a normal mailbox, the folder is usually just Inbox. For some localized accounts or subfolders, you may need to use the Folder Picker (the folder icon) to ensure the ID is correct.
Connection Ownership: If you share the Flow with a colleague, the Flow will still run using your connection (and your inbox) unless you change the Flow to "Run-only user" permissions.
Note on "V3" vs "Shared" Actions:
While you can use "Get emails (V3)" for shared mailboxes by typing the address, Microsoft also provides a specific "Get emails from a shared mailbox (V2)" action. It is generally better practice to use the dedicated Shared Mailbox action for shared accounts to avoid permission confusion.
Your action item:
To make your flow work with a normal mailbox:
Remove any Mailbox Address field from Get emails (V3)
Ensure the connection user is the mailbox owner
Use the correct folder path (e.g., Inbox)
Confirm emails exist and meet your filter criteria
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