Logitbias not working properly for chatcompletions api

I am not sure what API wrapper you are using, but the logit_bias key is a string because it is a JSON object. It is not possible that the key in a JSON object is an int as you have posted:

logit_bias= {15836:-100}

We (in this community) ran tests all yesterday and and it worked fine with the JSON key as a string, see @curt.kennedy below:

Also, from my testing:

Reference Community Tests: