TF402582 Workitem type contains Custom control DateTime which is not supported
This usually occurs when you try to introduce a new field for date and time in hosted xml templates in AzureDevOps.
The reason it occurs when DateTime Control is not correctly defined in one of the process templates
DateTime Control should be defined as follows
<FIELD name="RequirementsDue" refname="Custom.RequirementsDue" type="DateTime" reportable="detail"/>
Then the Control Label should defined as follows
<Control Label="Requirements Due" Type="DateTimeControl" FieldName="Custom.RequirementsDue" />