Just to note: I can see in this commit https://github.com/umbraco/Umbraco-CMS/pull/14784/commits/52702b8173cabadc037332b853b8dd44d4a03e02 that you're introducing changes to public methods. So changing

RequireUniqueEmailForMembers

and changing the arguments in MemberController.cs, these can be in use by anyone using Umbrao currently, so those are breaking changes that fail the build.