I have a last name with accent and multiple complicated last names, separated by hyphens, commas in my passport. I never encountered a system which accommodated all of these in China. Best case scenario, the accented letters gets switched to a the standard ones. Then usually my multiple last names are cut at the middle as it's too long. Finally sometimes all my name components gets stuck together, no space or hyphens.

Félicité Jean-David François Laurent => FELICITEJEANDAVIDFRANCO

Linking different bank cards on one app was impossible for example because my name was butchered in different was by the system and mismatched.

I'm never able to enter systems who ask for name as part of authentification, it's impossible to remember how my name was altered for each thing I registered.

As additional fun, many app or services are not accessible or crash if you are not a Chinese citizen with Chinese id, even if you have a long term resident permit.

Administrative life in China just sucks in general if you don't fit the norm. It really made me think using name as part of any authentification/login process is harmful because it's never gonna be handled well by programs. Let me login with my passport number and phone number for example, they are designed to be handled by such systems.