Following the blog "Create assignments in the field with collector" I can create assignments okay. The problem is that I cannot "Edit" the assignment in workforce dispatcher. I can assign it to a worker, but can't "Edit the Assignment" to set priority or due date. It opens, but the "Save" button is greyed out. Assignment created in workforce dispatcher can be edited just fine.
Workforce mobile 17.0.1
Collector 18.0.3, build 1033
ArcGIS Enterprise 10.7.1