Latest Facebook Messenger 221 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; Android 9; moto g(7) plus Build/PPWS29.98-66-2; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/75.0.3770.101 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/221.1.0.15.157;] Android 9 Moto G7 Plus
Mozilla/5.0 (Linux; Android 6.0; LG-K420 Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.149 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/221.1.0.15.157;] Android 6 K10
Mozilla/5.0 (Linux; Android 10; SNE-LX3 Build/HUAWEISNE-L23; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.99 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/221.1.0.15.157;] Android 10 Mate 20 Lite
Mozilla/5.0 (Linux; Android 10; SM-G973F Build/QP1A.190711.020; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/83.0.4103.106 Mobile Safari/537.36 [FB_IAB/MESSENGER;FBAV/221.1.0.15.157;] [ip:213.205.242.78] Android 10 Galaxy S10
Mozilla/5.0 (Linux; Android 10; SM-G973F Build/QP1A.190711.020; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/83.0.4103.106 Mobile Safari/537.36 [FB_IAB/MESSENGER;FBAV/221.1.0.15.157;] [ip:157.240.217.35] Android 10 Galaxy S10
Mozilla/5.0 (Linux; Android 10; POCO F1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.152 Mobile Safari/537.36[FB_IAB/MESSENGER;FBAV/221.1.0.15.157;] [ip:157.240.217.35] Android 10 Pocophone F1