Word document is always Read-Only when opened with Intent

I am trying to open and edit a word document located in my external storage in my Xamarin.Android App with MS-Word with this code:

File wordFile = new File(wordFilePath);
wordFile.SetWritable(true);

FileInfo fileInfo = new FileInfo(wordFilePath);
fileInfo.IsReadOnly = false;

Android.Net.Uri uri = FileProvider.GetUriForFile(Context, Context.PackageName + ".provider", wordFile);

Intent intent = new Intent();
intent.AddFlags(ActivityFlags.NewTask);
intent.AddFlags(ActivityFlags.GrantReadUriPermission);
intent.AddFlags(ActivityFlags.GrantWriteUriPermission);
intent.AddFlags(ActivityFlags.GrantPersistableUriPermission);
intent.SetAction(Intent.ActionView);

intent.SetData(uri);

Context.StartActivity(intent);

The problem is, that the file is always Read-Only. When I open the document via any file explorer (e.g. File Manager Pro) , it is not Read-Only and I can edit the file.

Am I missing any permission that i need to set in my app or FileProvider?

EDIT:

• I am logged in with my Office Account in the Android Word App
• Using WPS Office works just fine, so it has to be a special problem with MS-Word
• using intent.SetAction(Intent.ActionEdit); does not make a difference
• using intent.SetDataAndType(uri, "application/msword"); does not make a difference
• similar behavior using Google Docs: Using a FileExplorer I am able to open and edit the file. If I open the file with Google Docs through my app I can edit the file, but if I click Save, the app asks me to "Update the file to the new DOCX-Format". Then I can save the file to a new directory.

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Intent Comparision:

I used an Intent Intercept App to compare the intent from my app with the intent from a file explorer:

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My App (Word file is Read-Only):

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File-Explorer (Word file can be edited):

• using MIME-type from the file explorer intent.SetDataAndType(uri, "application/vnd.openxmlformats-officedocument.wordprocessingml.document"); does not make a difference

from Word document is always Read-Only when opened with Intent