It has been a few weeks, and I can’t update my anime list at all. I think it’s taiga problem, all 3 of the site is not functioning in the app.

  1. MyAnimeList disabled their API more than two weeks ago. It's currently not possible to use Taiga or any other application to update your MAL account.
  2. You're supposed to enter your Kitsu username rather than your display name. It's shown as "Profile URL" in your Kitsu settings. This distinction was recently introduced by Kitsu. The next version of Taiga will ask for your email address instead.
  3. You're supposed to enter your AniList username rather than your email address. Taiga's settings dialog specifically mentions this.