I've seen this discussed but haven't seen a solution other than escalating the ticket to engineering.
I have been using the Xfinity Stream app on a Roku Ultra for months. The other day it came up with the message "you have not purchased anything" instead of the menu.
I have reset and rebooted everything and spent an hour with customer support. When they opened a ticket the rep called me and just asked me to contact Roku instead.
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