If I install a Mira Connect for my customer, and in the future the customer uses a different reseller, will they have access to the room and settings I configured in Mira Portal?

No. Unless you’ve granted access permissions to the new reseller or the end user, the new reseller will not have access to your Mira Connect organization, site, and room settings. The new reseller will either have to ask you for Mira Portal permissions or will have to create a new room in Mira Portal and configure the equipment, and pair the Mira Connect to the new room.