Regarding your question, let's isolate to make sure the error is due to Trend Micro Security or not. Please follow the support page below to temporarily disable your Internet Security and check if you're still encountering the 403 error. Disabling or enabling your Trend Micro Security software Note: Please enable your Internet Security after the confirmation.
If the problem persists, the error may cause by authentication or channel problem. (you can refer to the YouTube Data API -Errors page for more details) Please contact YouTube support directly for further assistance.