Here too, it seems that the APP is broken and it is impossible to submit a support ticket.
The Partner Center app tries to load this non-existent resource and completely breaks.
It seems that it also happens in the "Properties" see the post: https://learn.microsoft.com/en-us/answers/questions/1657559/after-sending-my-package-i-am-required-to-have-pro
It was very frustrating to pay and have no way to communicate to file a support ticket.