A 401 loopback failure means WordPress can reach its own URL but is being asked to authenticate; isolate plugins and theme first, then have the host check authentication and firewall rules.
A 99% Canva export is usually a stuck design asset, an overly heavy video export, or a connection/browser issue; test a copy after confirming uploads and simplifying the export.
TikTok puts Repost in the mobile Share or long-press menu; if it is absent only on one account, update the app, check that account's status, and report the account-specific issue through the app if it persists.
Usually an update left the .maintenance file behind; delete only that file from the WordPress install root after confirming no update is still running.