Authentication Dialogue Box does not work for Switch.SetConfig change of "in_mode"?

[SmurfnSurf]

Hi,

Quick background, I have a Shelly Button 1 (for simplicity) activating a Central Heating Relay (mini Gen3), switching it on or off.

The relay is ALSO on a schedule, so I wanted to write a simple URL sent from the Shelly Button that if I select OFF, it disables the Input, which I understand essentially "deactivates" the Switch and thus any scheduled "On" calls. 

Switching the Shelly Button 1 back "On" should reactivate the Relay, setting it to "On" by setting the Toggle (in_mode: follow) and "initial_state":"match_input"}. I assume the schedule just continues from there. Small disclaimer, I am also investigating just disabling the schedules, but it's coming along as a lot more complicated, with scripts.

The OFF URL called from Shelly Button 1 to the CH Relay:

http://admin:password@192.168.47.127/rpc/Switch.SetConfig?id=0&config={"in_mode":"detached","initial_state":"off"}

The ON URL called from Shelly Button 1 to the CH Relay:

http://admin:password@192.168.47.127/rpc/Switch.SetConfig?id=0&config={"in_mode":"follow","initial_state":"match_input"}

If I leave OUT the Authentication, it works fine, testing OFF and ON as follows:

http://192.168.47.127/rpc/Switch.SetConfig?id=0&config={"in_mode":"detached","initial_state":"off"}
http://192.168.47.127/rpc/Switch.SetConfig?id=0&config={"in_mode":"follow","initial_state":"match_input"}

But when Authentication is added back in, (also using a Chrome Browser), the "sign in" text box in Chrome keeps prompting for the username and password. It doesn't take the password. 

If I click cancel (the Chrome auth dialogue), I see:

{
  "restart_required": false
}

The odd thing is if I just issue a simple GetConfig (as below, I can type in the admin:password in the dialogue box and it gets the result of GetConfig just fine. 

http://192.168.47.127/rpc/Switch.GetConfig?id=0

Does anyone know why does it not "take" the password when I test using the in_mode command and how to get around this please?

Thx!

EDIT: The Chrome Browser console responds with 

Failed to load resource: the server responded with a status of 401 ()

EDIT2: I used HttpToolkit and got this output, if it helps? See METHOD GET.txt file attached.

METHOD GET.txt

Edited October 3 by SmurfnSurf