As configured:

Send: T0
Recv: ok
Send: T1
Recv: ok
Send: T2
Recv: ok
Warn: Not queuing T3, that tool doesn't exist according to the printer profile or was reported as invalid by the firmware. Make sure your printer profile is set up correctly.
Warn: Not queuing T4, that tool doesn't exist according to the printer profile or was reported as invalid by the firmware. Make sure your printer profile is set up correctly.
Warn: Not queuing T5, that tool doesn't exist according to the printer profile or was reported as invalid by the firmware. Make sure your printer profile is set up correctly.

After upping extruders to 6:

Send: T1
Recv: ok
Send: T2
Recv: ok
Send: T3
Recv: ok
Send: T4
Recv: ok
Send: T5
Recv: ok

Script you sent:

Send: M115
Recv: FIRMWARE_NAME:Marlin 1.1.8 (Github) SOURCE_CODE_URL:https://github.com/MarlinFirmware/Marlin PROTOCOL_VERSION:1.0 MACHINE_TYPE:Printer EXTRUDER_COUNT:1 UUID:cede2a2f-41a2-4748-9b12-c55c62f367ff
Recv: Cap:SERIAL_XON_XOFF:0
Recv: Cap:EEPROM:1
Recv: Cap:VOLUMETRIC:1
Recv: Cap:AUTOREPORT_TEMP:1
Recv: Cap:PROGRESS:0
Recv: Cap:PRINT_JOB:1
Recv: Cap:AUTOLEVEL:0
Recv: Cap:Z_PROBE:0
Recv: Cap:LEVELING_DATA:0
Recv: Cap:BUILD_PERCENT:0
Recv: Cap:SOFTWARE_POWER:0
Recv: Cap:TOGGLE_LIGHTS:1
Recv: Cap:CASE_LIGHT_BRIGHTNESS:1
Recv: Cap:EMERGENCY_PARSER:0
Recv: ok
Send: M155 S2
Recv: ok
[...]
Send: M163 S0 P1.0
Recv: ok
[...]
Send: M163 S1 P0.0
Recv: ok
[...]
Send: M163 S2 P0.0
Recv: ok
[...]
Send: M164 S3
Recv: ok
[...]
Send: M163 S0 P0.0
Recv: ok
[...]
Send: M163 S1 P1.0
Recv: ok
[...]
Send: M163 S2 P0.0
Recv: ok
[...]
Send: M164 S4
Recv: ok
[...]
Send: M163 S0 P0.0
Recv: ok
[...]
Send: M163 S1 P0.0
Recv: ok
[...]
Send: M163 S2 P1.0
Recv: ok
[...]
Send: M164 S5
Recv: ok
[...]

Send: T0
Recv: ok
[...]
Send: T1
Recv: ok
[...]
Send: T2
Recv: ok
Send: T3
Recv: ok
[...]
Send: T4
Recv: ok
[...]
Send: T5
Recv: ok