3 meters, i also tried another access point and tried turning my phone as acess point.

Hello,
First of all I admit that I am not an expetro in gcode.
Second, i cant' run the wi fi on my duet 2 wifi, here are the tests that i've done :
Upgrade duet to the lastest fw
Install it on the correct order ( M997 S0:1:2)
Make sure to send the correct instruction ( M587 S"xxx" P"xxx")

I paste here some dialog, maybe you understand better than me.

m122
=== Diagnostics ===
RepRapFirmware for Duet 2 WiFi/Ethernet version 2.03 running on Duet WiFi 1.02 or later
Board ID: 08DGM-9T6BU-FG3SD-6J1F8-3S86Q-1BMZF
Used output buffers: 1 of 24 (10 max)
=== RTOS ===
Static ram: 25680
Dynamic ram: 93244 of which 816 recycled
Exception stack ram used: 288
Never used ram: 11044
Tasks: NETWORK(ready,1304) HEAT(blocked,1236) MAIN(running,3792) IDLE(ready,160)
Owned mutexes:
=== Platform ===
Last reset 00:01:36 ago, cause: power up
Last software reset time unknown, reason: Unknown, spinning module Platform, available RAM 10672 bytes (slot 0)
Software reset code 0x00b0 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0040080f BFAR 0xe000ed38 SP 0x20004adc Task 0x4e49414d
Stack: 0044cdbf 0044cbd4 61005000 00000000 4074e600 00000000 00000000 3331bb4c 40000000 3f317200 b5ddea0e 388aa908 bb35fe81 3c4192f5 00000000 00000000 3f800000 00000000 00000000 60000010 0044ce71 20002c48 ffffffff
Error status: 0
Free file entries: 10
SD card 0 detected, interface speed: 20.0MBytes/sec
SD card longest block write time: 0.0ms, max retries 0
MCU temperature: min 47.1, current 47.4, max 47.5
Supply voltage: min 1.7, current 1.7, max 1.7, under voltage events: 0, over voltage events: 0, power good: no
Driver 0: ok, SG min/max not available
Driver 1: ok, SG min/max not available
Driver 2: ok, SG min/max not available
Driver 3: ok, SG min/max not available
Driver 4: ok, SG min/max not available
Date/time: 1970-01-01 00:00:00
Cache data hit count 180801538
Slowest loop: 99.68ms; fastest: 0.06ms
I2C nak errors 0, send timeouts 0, receive timeouts 0, finishTimeouts 0, resets 0
=== Move ===
Hiccups: 0, FreeDm: 169, MinFreeDm: 169, MaxWait: 0ms
Bed compensation in use: none, comp offset 0.000
=== DDARing ===
Scheduled moves: 0, completed moves: 0, StepErrors: 0, LaErrors: 0, Underruns: 0, 0
=== Heat ===
Bed heaters = 0 -1 -1 -1, chamberHeaters = -1 -1
=== GCodes ===
Segments left: 0
Stack records: 1 allocated, 0 in use
Movement lock held by null
http is idle in state(s) 0
telnet is idle in state(s) 0
file is idle in state(s) 0
serial is ready with "m122" in state(s) 0
aux is idle in state(s) 0
daemon is idle in state(s) 0
queue is idle in state(s) 0
autopause is idle in state(s) 0
Code queue is empty.
=== Network ===
Slowest loop: 1.26ms; fastest: 0.00ms
Responder states: HTTP(0) HTTP(0) HTTP(0) HTTP(0) FTP(0) Telnet(0) Telnet(0)
HTTP sessions: 0 of 8

• WiFi -
  Network state is changing mode
  WiFi module is idle
  Failed messages: pending 0, notready 0, noresp 0
  Failed to get WiFi status
  Socket states: 0 0 0 0 0 0 0 0
  m115
  FIRMWARE_NAME: RepRapFirmware for Duet 2 WiFi/Ethernet FIRMWARE_VERSION: 2.03 ELECTRONICS: Duet WiFi 1.02 or later FIRMWARE_DATE: 2019-06-13b2
  ok
  WiFi reported error: no known networks found
  WiFi module is idle

m552 s0
ok
M587 S"APE1" P"AndreaPozzetto9"
ok
m587
Remembered networks:
APE1 IP=0.0.0.0 GW=0.0.0.0 NM=0.0.0.0
ok
m552 s1
ok
WiFi reported error: no known networks found
WiFi module is idle
m552 s0
ok
M588 S"*"
ok
M587 S"APE1" P"AndreaPozzetto9"
ok
m552 s1
ok
WiFi reported error: no known networks found
WiFi module is idle