Set up default email (Outlook) to send invoices. Need help.

I use Quickbooks Mac Plus 2024 and I need to link to MicroSoft Outlook for Mac, from the MicroSoft 365 Subscription. I had to re-install my computer’s OS and other software and now I am not able to connect to my Outlook. I’m not finding instructions that work online. I was able to link to Apple Mail, but I don’t want that and want to unlink from it and use only the MicroSoft Outlook for Mac. I was using this combination before, so I know it works. Thank you for helping.