With the Feb 2024 adding support in Field Maps Designer to enable m-values on new layers, we were looking to enable it for existing services. I looks like the toggle is grayed out and we are unable to edit either from the overview page or from using "Update Service Definition".
![304032d6-821b-49a3-a6db-5543b6c5e3ed.jpg 304032d6-821b-49a3-a6db-5543b6c5e3ed.jpg](https://community.esri.com/t5/image/serverpage/image-id/100017iB408D3D684A31CC7/image-size/medium?v=v2&px=400)
It was suggested to by someone that this was a known bug, but I cannot find any documentation on that, so is there a way to enable this for existing services?