Sooo,
We find pre-existing Jira and Confluence instances are now failing when trying to manage apps. It was working yesterday, and affects all apps I’ve tested - ours and other vendors.
Error:
batch.js?healthcheck-resources=true&hostenabled=true&locale=en-GB:135 GET https://marketplace.atlassian.com/rest/2/addons/nnnnnnnnnnnn/pricing/datacenter/live?countryCode=GB net::ERR_FAILED 403
Due to this problem it is not possible to do anything to an installed app through Manage Apps.
(update)
yep : Atlassian Developer Status - Marketplace Apps are not configurable on all Server/DC products