Symptoms

The Reseller Authorization screen was replaced with My Partnerships (https://docs.cloudblue.com/cbc/21.0/Product-Lifecycle-Management/What's-new.htm#PLM_1.11.768) but for some reason, both of them are visible in the reseller's UX1 after upgrade PLM to version 1.11:

Cause

This situation could have happened because the upgrade process from PLM 1.10 to 1.11 hasn't been successfully completed. It failed on step "updateDestroyOnCancelPerProductLine". During this operation, there was an error on calling xmlrpc because of network failure. The task "toggleResellerAuthorizationNavigationItems" is the last of the upgrade tasks and it has not been called at all. 
There is a software issue with id #PDI-2198 "Make upgrade actions independent and move icon hiding to v1.12" to prevent such situations when during PLM upgrade process there is no specific procedure for fail cases. Even if some actions were not finished but pod can start and continue work.

Resolution

You can hide the extra tab Reseller Authorization in UX1 Navigation (under Provider CP https://docs.cloudblue.com/cbc/21.0/UX1-for-Resellers-Provider-Guide/Configuring-Order-for-Navigation-Items-and-Tiles-in-UX1.htm), by marking following parameters as hidden:

navigation@http://odin.com/servicesSelector#ux1-reseller-plugins

navigation@http://odin.com/servicesSelector#ux1