Could a VPN or proxy be causing the YouTube 403 error?

Yes, using a VPN or proxy server can sometimes interfere with YouTube's subscription verification process and trigger a 403 error. This is because your IP address may be flagged as suspicious or inconsistent with your verified account information. Try temporarily disabling your VPN or proxy and see if the error resolves itself. If it does, you may need to adjust your VPN settings or contact your VPN provider for assistance.