[HELP] New Outlook for Win 11 + IMAP (cPanel): Cannot Change Sender Display Name

Hi everyone. I'm facing a tough issue with the New Outlook app on Windows 11 (the version that replaced the Mail/Calendar app).

I have my work email configured as an IMAP account, hosted on a cPanel server. Sending and receiving work fine, but I have a critical display issue:

The sender's name consistently appears as the full email address (user@domain.com) instead of the actual display name (Display Name).

I have attempted the standard fixes with no success:

1. Server/Webmail Configuration (cPanel): Changed the "Identity/Display Name" to the correct name in Roundcube. Result: Failed.
2. Classic Control Panel (Mail): Tried to find the field "Your Name", but there's no option in the interface.

This seems to be a common restriction where the New Outlook ignores local IMAP settings.

My question is:

Is there a known registry tweak, PowerShell script, or advanced New Outlook setting that can force a specific Sender Display Name for a non-Exchange/Microsoft 365 IMAP account?

Any help or working workaround from the community would be greatly appreciated!