Why is a ticket field not required to solve the ticket even after I select that option?

Question

Why is a ticket field not required to solve the ticket even after I select the option Required to solve a ticket?

Answer

Ticket field requirements can be overridden by conditional ticket fields even when you select the option Required to solve a ticket in your ticket field settings. 

You can change the Required drop-down list in your conditional ticket field settings to make the ticket field required to solve.

For more information, see this article: Making conditional ticket fields required.