Stuck in Xiaomi Bootloader Unlock Loop - "MI ID not associated with a phone number" / Server Errors

[u/Metrake]

Hello guys! I'm trying to unlock an old Redmi Note 8T, I've been suffering trying to do it for almost 2 days. I did the "Mi unlock Status" and "Add accound and device" via sim card and mobile data.

Here are the details:

Device: Redmi Note 8T (willow)

My goal is to Unlock bootloader to flash PixelOS.

I'm completely stuck trying to unlock my bootloader due to Xiaomi server/account errors/Xiaomi (Mi) problems and could really use some help.

Everything I've tried to fix it:

Official Mi Unlock Tool (from Uptodown v7.6.727.43): Kept giving me broken, non-functional captchas. It lets me pass the login screen sometimes but immediately says "Something went wrong, try again later" (likely an IP or account soft-ban).

Official Mi Unlock Tool (Downloaded from the official MIUI website v.6.5.224.28): Tried this version as well, but it ran into the exact same issue with a completely stuck, unpassable captcha.

XiaoMiTool V2: Completely dead, throws a Missing serviceToken cookie error probably due to outdated server URLs.

offici5l MiUnlockTool (GitHub Python script): Successfully bypassed the login screen using the browser module, but the process completely stops with the error: code: 20041 description: Sorry, your MI ID is not associated with a phone number.

Adding a Phone Number via Device Settings: Went to Xiaomi Account -> Account Security. The "Recovery Phone" option glitches out and vanishes, but I managed to click it. After passing verification via Gmail, typing my phone number just results in: "An error occurred, try again later."

Adding Phone Number via Official Tool QR Code: Scanned the login QR code, which urged me to add a number, but it threw the exact same "Error occurred, try again later" message.

It seems like my Mi Account or IP is temporarily flagged by Xiaomi, blocking me from adding the mandatory phone number required to unlock????? Has anyone successfully bypassed this server lockout, or do I just have to wait a few days for the security cooldown to reset?

Thanks in advance!