Currently, the svg Icons, when used as both normal and high resolution Icons for O365 Add-Ins, work in browser. However, the validation infra does not validate the svg icons in the manifest.xml.
npx -y office-addin-manifest validate manifest.xml
It produces the following error:
Error #1:
Unsupported High Resolution Icon URL File Extension: The manifest high resolution icon URL must have a valid image file extension. Please see https://aka.ms/oackhighresolutionicon for details.
- Details: svg
Error #2:
Unsupported Icon URL File Extension: The manifest icon URL must have a valid image file extension. Please see https://aka.ms/oackicon for details.
- Details: svg
The manifest is not valid.
Please consider supporting the svg icons officially, so that we, the Add-In developers, don't need to maintain the icons of different dimensions.
Additional notes:
- The links in the error messages do not seem to redirect to proper Information.
- As far as I have understood it, the actual validation is happening remotely, as can be seen here: