cant access a web with credentials

hi, im having an issue where i cant access with my credentials to the web, im always getting the html data of the login page even if i change the configuration of the data origin to basic.

 i've tried a lot of variations i saw in the forum to try to connect, i checked wireshark and when i connect to the web with the configuration in basic  it never throw a POST, always a GET.

Also i found this code and i used it in a blank query and putting the configuration in anonymous but im getting the same result

let
url = "web",
#"user" = "xxxxxxxxx", // Username
#"pass" = "xxxxxxxxx", //Password

EncodedCredentials = "Basic " & Binary.ToText(Text.ToBinary(#"user" & ":" & #"pass"), BinaryEncoding.Base64),

Source = Table.FromColumns({Lines.FromBinary(Web.Contents(url, [Headers=[#"Content-Type"="application/x-www-form-urlencoded", Authorization="EncodedCredentials"]]), null, null, 65001)})

in
Source

Thanks for the help!