I have Options and Options+ running on both my work and personal Macbooks.

Details:
- One runs Catalina, one runs Big Sur. Both run Options+ 0.50.1402.
- MX Keys and MX Master 3 are connected on each computer via unified receivers.
- Both are on the same subnet (192.168.1.60 for one, 192.168.1.232 for the other)
- Both are connected to the same wireless network.
- MacOS firewall is enabled on my work PC, and I can't disable that. It also has Cylance ForeScout SecureConnector and CylancePROTECT.
- No VPN enabled for either machine.
- In System Preferences/Security & Privacy/Privacy tab: Logi Options Daemon, Logi Options, and Logi Options+ are allowed control under Accessibility. Logi Options+, Logi Options Daemon, and Logitech Unifying Software are allowed "input monitoring".
- Machines can ping back and forth. They can connect samba shares on each other, and so on.
- Running the command nc -vnzu 192.168.1.X 59867 returns succeeded in both directions. Ditto for 59868.
- Running nc -vnz 192.168.1.X 59866 also succeeds in both directions.

When I try to connect Flow, I get the "No computers found. Bummer!" message. I can't really think what else to check! Any suggestions?