This code works already. See my test https://test.wikidata.org/wiki/Q149653 at the end the list

I intended this as an application to be able to add Okanagan labels to items. How would I do the application? The requirements for that are less than having its own Wikipedia right?

Minus CLDR because "oka" is part of CLDR release already. Code works therefore for monolingual text values already.

Anytime i attempt to add a Oka label to Lake Country (Q1711455) i get the following error: "Unable to update entity: The supplied language code "oka" was not recognized." And than a second error which says "Unable to update entity: {}" pops up shortly after

In T399618#11007497, @Trade hat geschrieben:

Anytime i attempt to add a Oka label to Lake Country (Q1711455) i get the following error: "Unable to update entity: The supplied language code "oka" was not recognized." And than a second error which says "Unable to update entity: {}" pops up shortly after

This ticket is for "support for monolingual text values." And this works already. Adding labels in this language needs more/other work.

@Immanuelle: In this case I suggest you rephrase the task.

See ticket specifically to add Terms T400045