TikTok won’t let me switch accounts – “Unable to switch accounts”

Hi, since today I haven’t been able to switch between my TikTok accounts.
Whenever I try to switch accounts, I get “Unable to switch accounts”, and now I’m also sometimes getting a “Server error” message.
My internet connection is working perfectly fine, and TikTok itself works normally otherwise. I’m on iPhone and I’ve already updated TikTok, cleared the cache, switched between Wi-Fi and mobile data, and completely restarted my iPhone, but nothing has fixed it.
Is anyone else having this problem today? Could this be a server-side issue?