UN Charter, Article 2.7:

Article 2

The Organization and its Members, in pursuit of the Purposes stated in Article 1, shall act in accordance with the following Principles.
....
7. Nothing contained in the present Charter shall authorize the United Nations to intervene in matters which are essentially within the domestic jurisdiction of any state or shall require the Members to submit such matters to settlement under the present Charter; but this principle shall not prejudice the application of enforcement measures under Chapter Vll.
How interpretation and implementation of these principles have changed since 26 Jun 1945 !

Chapter VII applies only if international factors apply. Have the "coupists" done anything beyond the borders of Honduras ? Has any nation-state (or for that matter, any transnational actor) had a material role in the "coup" ?

Just as the President of the United States (over successive administrations) has become more and more the Mayor of the United States, the United Nations has sought to become the City Council for the World.

Assuming arguendo (that is, accepting as true without proof, solely for the purposes of this argument) that everything that the "coupists" did was illegal under the Honduran constitution and its laws, all of that consists of domestic acts within its borders.

And, since the OAS has been mentioned, OAS Charter, Article 19:

Article 19

No State or group of States has the right to intervene, directly or indirectly, for any reason whatever, in the internal or external affairs of any other State. The foregoing principle prohibits not only armed force but also any other form of interference or attempted threat against the personality of the State or against its political, economic, and cultural elements.
Since we live in a period of interventionism, non-interventionist principles are interpreted and implemented in a very different manner than the drafters intended - or, are simply ignored, as appears to be the present case.