I got exactly same problem as your. After talked with the support and monitor all his works, we suspect the windows firewall/antivirus made the cmd flash problem which softbrick the mi11U. Today i flashed back from global to xiaomi.eu ( global also does Not pass safetynet also) with windows...
no, you cant flash if you use dipper twrp (error 7 in twrp) i tried before. currently we dont have ursa twrp so dipper twrp is our only choice. search twrp 7 error and you know how to modify the ursa rom to dipper rom to flash.
I use mi 8 ee around month also. Use mi 8 twrp with eu rom, however, everytime when i want to flash new rom, i have to modify the rom file from ursa to dipper so twrp flash the file. Working great btw :)