"_error_id":26,"_error_msg":"freq required" for /v2/signal/tx request

I am writing an integration for the MisterHouse HA platform and when I send a request to the signal/tx API function, no matter what it always returns a “freq required” message even though the freq is defined in the content. You can see the exact request below from the LWP agent debugs.

	( 	
		{
             '_content' => '{
								"modulation":"OOK",
								"bps":"40000",
								"freq":"38",
								"use_scan":"false",
								"data":"000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFC000000000000000000000000000000000000000000003FFFFFC00000FFFFFE00000FFFFFF800003FFFFFC00000FFFFFE000007FFFFF80000000000000000FFFFFE00000FFFFFF800003FFFFFC0000000000000000FFFFFF00000000000000001FFFFF800000000000000007FFFFFC0000000000000001FFFFFE00000000000000003FFFFF800003FFFFFC0000000000000001FFFFFE00000000000000007FFFFFC00001FFFFFC00000000000000003FFFFFC00001FFFFFC00001FFFFFE00000FFFFFF000007FFFFE000007FFFFF800003FFFFFC0000000000000001FFFFFE00000FFFFFF80000000000000001FFFFFE00000000000000007FFFFF00000000000000001FFFFFE00000000000000003FFFFFC00000000000000007FFFFE00000000000000001FFFFFC00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFC0000000000000000000003FFFFF80000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF80000000000000000000003FFFFF8000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
								"reps":"1",
								"encoding":"hex"
							}',
             '_headers' => bless( {
                                    'host' => '192.168.1.10',
                                    'bond-token' => '<removed>',
                                    '::std_case' => {
                                                      'bond-token' => 'BOND-Token'
                                                    }
                                  }, 
								  'HTTP::Headers' 
								),
             '_uri' => bless( 
								do{\(my $o = 'http://192.168.1.10/v2/signal/tx')}, 
								'URI::http' 
							),
             '_method' => 'PUT'
        }, 
		'HTTP::Request' 
	);


	request: http://192.168.1.10/v2/signal/tx failed - 400 Bad Request {"_error_id":26,"_error_msg":"freq required"}

Version:
{“target”:“zermatt”,“fw_ver”:“v2.10.21”,“fw_date”:“Wed Feb 19 15:31:13 UTC 2020”,“uptime_s”:166065,“make”:“Olibra”,“model”:“BD-1000”,“branding_profile”:“O_BD-1000”,“bondid”:“ZZBL5****”,“upgrade_http”:true,“api”:2,"_":“1143****”}