Magento - The consumer isn't authorized to access %resources

If you encounter this error when pushing products from your vendors one solution that may work to resolve is doing the following:

To allow OAuth Access Tokens to be used as standalone Bearer tokens, follow these steps: 

1. Navigate to Admin > Stores > SERVICES > Oauth > Allow OAuth Access Tokens to be used as standalone Bearer tokens and select "Yes". 

2. Click "Save Config". 

3. Flush the Magento Cache through the Cache Management option.