FL uses Cloudflare, so this is unlikely to be a "real" connectivity problem (you'd be unable to post here otherwise, as we also use it). We have already discarded DNS as a potential cause, and this...
...makes me think something in your networks and/or country is blocking it. GoodbyeDPI or PowerTunnel may be worth a try (Cloudflare no longer supports domain fronting, but you can use TLS fragmentation or Erase SNI).
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