Yeah, ran into that same issue a while back — it’s caused by the plugin still relying on the old oauth_callback method (oob), which Twitter no longer supports for web-based apps. Kind of surprising it's not updated yet, especially for a theme as polished as Uptown. I ended up switching to a custom integration using Twitter’s newer API v2 — a bit of work but at least it’s stable now.
Funny enough, I was debugging this late one night and took a break on Mostbet — https://mostbet.net.in/promo/bonus/ ended up hitting a bonus promo and kind of forgot how annoyed I was with the plugin 😅 Worth checking out if you need a breather while waiting on the devs to push a fix.