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Sonoff Switch Pairs but will not connect to WiFi

After Successful pairing and Renaming the device it does not connect to wifi and Green light keeps blinking, tried to delete and repair but no luck.

One device is connecting and another - Does not.... :( 

75 people have this problem

i've seen the thread is very very old, but newest entry is only 17 days ahead.

So i've got also the problems with the Sonoff T1 (3gang UK Version) to connect to my new
Edimax RA21S Accesspoint. I had previous the Edimax 6808 V.2 which work pretty well, also with T1.

Sonoff Basic, 4CH, Wemos D1 Mini, ESP8266-1, ESP32 aso.,  all are working well.

Only the T1 won't connect.

I found now out why.
Its the Wifi "preamble". It can be set to "Long" or "Short"(default).
Set it to LONG and the T1 can connect.
Well some AC can't be configured this details, but if, try it.
It should be:
LONG preamble
20MHz Bandwith 
WPA2 mixed (sometimes only AES work?!)
DTIM Period 3 (mostly its 1 as default)
Beacon interval 100
CTS Protection disabled
WMM disabled

and i also found (i don't realy know why this matter), but if  5GHz has the same SSID
it won't connect. Dont ask me why.

Hope that helps a bit out of a 3 year old (long)  thread.

all the best

Thank you, Franky!

Registered here only to say that!

I disabled "Short Preamble" and "WMM Mode" in my OpenWrt and my TH16 finally connected!

Other settings looked ok:

DTIM Interval - 2

Mode - N

Width - 20MHz

RTS/CTS Threshold - off

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