@jacobm Sorry for the delayed response.
Kindly check first if your vendor has added any payment method under the Billing submenu of Store settings in the vendor dashboard https://prnt.sc/k4JFHFZI8JrP. Once the vendor has added a payment method next go to admin dashboard >>MultiVendorX >>Settings >>Commissions, here check if you have configured the commissions or not https://prnt.sc/MgX935zFdOdl.
Then you need to go to Admin dashboard>>MultiVendorX >>Commissions , here you need to check if the commission status is paid or unpaid (https://prnt.sc/TLGkcmJ-ygdU). If the commission status is unpaid, mark that as paid(https://prnt.sc/N9uD0MBLiOZ8). In this process if you face any error share the error log with us so that we can help you accordingly.