How to Automatically add a related deal to logged calls

Update: I put updated working code at the bottom of the post

In my crm I always have a deal for every contact. I usually am referencing the deal and rarely the contact. So if there isn't a log called in the deal module i usually miss it. That wasn't too bad until I started using telephony and it only logs in in the contact module so I am missing all of the logged calls.

So i made this function to fire whenever a call was logged.

It is supposed to add the related deal to the calls module

//line is to get deal information using the deal number.
dealmap = zoho.crm.getRecordById("Deals", dealID);
//line is because i couldnt get the search key to work in the above line
dealName = dealmap.get("Deal_Name");
//stuff below defines map. "what_Id" is the related field field name in calls
mp = Map();
mp.put("What_Id",dealName);
//updates the calls to include the deal name in the related field
update = zoho.crm.updateRecord("Calls", callID, mp);
info mp;
info update;

I am getting this error message back

Info

{"What_Id":"1258 - Joseph Sergi - Other Insulation"}
{"code":"MANDATORY_NOT_FOUND","details":{"api_name":"$se_module"},"message":"required field not found","status":"error"}

I think the MANDATORY_NOT_FOUND means its the wrong module name but that doesn't make sense.

I've been messing with this for hours and would appreciate any help.

Thanks in advance

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