Unable to send emails from Apple Mail account in old Outlook full program

Hello,

I just tried to send an email utilizing my Outlook full program from my Apple email account which I created all the way back when the domain for email for what is now called iCloud email was still @me.com and it brought up the PW box but the PW isn't working. I know the PW is 100% correct. It works on my iPad Pro and iPhone 13 Pro Max using the native email apps on both. I am going to cross post this problem to the Microsoft Community Forum. Important to note: I do NOT use the NEW OUTLOOK; I still use the OLD OUTLOOK and I use the full program that I downloaded directly from my Microsoft 365 account a very long time ago, not any sort of App from the Microsoft/Windows App Store on my Win11 Pro computer. Also important to note, I am still able to receive new emails in my Outlook, I am just unable to SEND any emails. Can someone please confirm for me what the SMTP server information is so I can check my settings in addition to helping me to troubleshoot this issue?

Thank you.

[Re-Titled by Moderator]