@Yuvi
Thank you for posting in Microsoft Q&A forum.
As we mentioned that uninstall button in software center is greed out for only few users,this behavior was really odd.Since most of our user could click this uninstall button,our deployment was successfully.I have do many researchs and i get some similar case just for your refernce and hope these situation have some ideas to help us:
--->https://social.technet.microsoft.com/Forums/ie/en-US/aaab2009-5b0e-4d5c-be20-549471393bbd/why-is-the-uninstall-button-in-software-center-greyed-out?forum=ConfigMgrAppManagement
--->https://social.technet.microsoft.com/Forums/en-US/e4572ab4-37ea-4dcb-b7db-c72ffe478658/uninstall-option-greyed-out?forum=configmanagerapps
Have a nice day!
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