That does not make you an authorized seller of the brand, nor does it insure that your customers are entitled to all of the customer service and warranty offered by the brand.
Sometimes the brand owner is correct in these disputes. Perhaps more often than many Amazon sellers would prefer, and Amazon is taking appropriate legal action to protect itself by being drawn into this dispute.
There have been disputes like this for well over 50 years in the camera industry.
I remember when Pentax Cameras imported into the country by both businesses and individuals had the Pentax logos defaced because of infringement. I also remember when Minolta introduced the M-tag and a different US warranty to stop parallel imports.