Recent update by peppy, b20210810cuttingedge has the new ANTICHEAT update. So this won't be updated until I'm sure I can think of the other way...

A modified client for multiaccounting on osu!

Scroll down in Options until you see Multiaccount Mode (Device Spoofer). Turn that on, put your generated device and then restart. Simple as that!

Try to use no AHC version
Alternatively, you can make GitHub issues OR contact me directly in my discord server here discord.gg/??Sez?????