version -  CRM 2016 onpremise  

When i try uninstall PowerMailChimp (solution managed), throws me duplicate key error. 

I think CRM insert in the SQL these values because is a managed solution and when he try insert, do this error.

Where CRM(table sql) try insert these values? and why duplicate values?

Edit: If this can help for the question/error: We have 3 enviroments PRO-PRE-DEV, and we did 1 backup with values since PRO for PRE.

When we did this backup, we change too the server where Database placed.