@SamWheat-7447 You can't change App Registration to Enterprise application. You need to create a new Non-Gallery application under Enterprise applications for this purpose. This will create a corresponding application under App Registration as well. Once the new application is created, you need to update your application code to use the App ID of the new application.
You can also use below Graph Calls to get AppTemplateID of the Gallery Applications and bootstrap a new Non-Galery application by using AppTemplateID of any gallery app that you want to use as a template.
- GET https://graph.microsoft.com/beta/applicationTemplates
- POST https://graph.microsoft.com/beta/applicationTemplates/8b1025e4-1dd2-430b-a150-2ef79cd700f5/instantiate {
"displayName": "MyApp4Test"
}
Please do not forget to "Accept the answer" wherever the information provided helps you. This will help others in the community as well.