Unable to recover username of lost account; no guides on the website has helped

Hi!
I've been spending the last hours trying to recover an email address that I have my Minecraft account on. Due to a software bug in the launcher, I was logged out and I do not remember the email. The account recovery guide on the website has not helped, as it only provides me with the first two letters which sadly weren't enough.

I've looked at different ways of recovering with Minecraft username or through my recovery mail, however with no luck. I've also looked at several support guides, everything from 'Forgot username' to 'Sign in to Microsoft Account' to guides on Minecraft.net regarding 'Minecraft: Java Account'. I've also looked through email on the recovery account and my other email accounts. I can find mails on the account that was my former Mojang account which confirm it has been migrated to Microsoft, but I am still unable to find any more information than the first two letters.

For some reason I am unable to find a mail address, a inquiry form or any sort of human assistance or even chatbot assistance on Microsoft's websites and I am therefore resulting to the last possible outcome, which is asking here.

So, does any other Microsoft users know of any last tips, tricks or maybe a way to come in contact with someone who actually works in Microsoft Support? Because right now I don't see any way I'm going to recover my account.

:)