I made a $13k tax payment on my Amex Biz Platinum with PayUSATax.com as I needed another $11k to meet my SUB minimum spend. The charge went through and earned 1.5x points but was not counted towards the minimum spend. The support case keeps getting opened and closed via chat. They keep pointing to the following:
"Eligible purchases are purchases for goods and services minus returns and other credits. Eligible purchases to meet the Threshold Amount do NOT include fees or interest charges, purchases of traveler's checks, purchases or reloading of prepaid cards, purchases of gift cards, person-to-person payments, or purchases of other cash equivalents."

Can you file a CFPB complaint for a business card? Is that the only option available for this? I wasn't sure if anyone else had found success with Amex support.