Sampat Kumar
Ansys Employee

Hi Michael,
As you can use the number of options available after right click on the mesh to see which one is more suitable. 
1. Use the multizone method in the method option after right click on the mesh. 
2. You can perform selective meshing for the individual part and verify which part is failing. 
3. Change the mesh sizes for the parts that failed to mesh.
4. Remove mesh defeaturing by navigating to “Mesh” >> “Sizing” >> “Mesh Defeaturing” >> “No”, and see if that helps.
5. you can use the tet mesh patch-independent method if you face any problem with the multizone. 

Please let me know if you face any issues.