I had to re-generate my Twitter API key, secrets and token after temporarily deactivating my Twitter account https://developer.twitter.com/en/docs/authentication/oauth-1-0a
Twitter API test
I don't know if having the same OS (Debian Stable) on both computers makes a difference, or if I'm doing things in a more systematic way, but I have had no Syncthing issues — and I'm syncing 187 GB.