I have an API call to my OAuth 2.0 verified step for GHL (highlevel) - I believe that the issue is that the app within GHL does not require permissions from the user to be able to read/write calendar appointments, so when I try to make an API call to get free/busy information from GHL it returns a 404 Error because I guess it gets blocked.
None of the GHL modules is asking for scopes that are necessary for Calendar GHL API Endpoints. You will have to use as a workaround the HTTP "Make an OAuth 2.0 request" module where you can add all necessary permissions (scopes).
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But you need then Advanced API for this. Is it true?