RESOLUTION: You can use the Resolution Center ONLY if the host officially "hires" you as a host using the Marketplace portion of the website. My host, although she did find me on the Marketplace and I provided her a quote for services via the same channel, when she added me to the account, she "invited" me to co-host which, apparently, is a different type of relationship than if she had done some operation to add me through the Marketplace.
So, there is a nuance here that does not make complete sense to me. Nor does it make sense that they couldn't migrate my relationship from an "invited host" to a "hired host" (or that they make any kind of distinction anywhere) so we could use the Resolution Center to process payments. IIWII.
To get to this point took days and days and days of conversations and escalated 3 times.