Can not create a vault on a network drive

Hello together,
i have several network drives on a domain Server connected to my client PC.
On these drvies i have permission to create/change/delete.
My Client runs on Windows 10, the Server where the network Drive is located on Microsoft Windows 2012 R2.
When i try to open a new vault on these network drives, i get the following error message after the password screen in the creation process:

java.nio.file.AccessDeniedException: T:\HB\Test\Test\masterkey.cryptomator
	at java.base/sun.nio.fs.WindowsException.translateToIOException(Unknown Source)
	at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(Unknown Source)
	at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(Unknown Source)
	at java.base/sun.nio.fs.WindowsFileSystemProvider.newByteChannel(Unknown Source)
	at java.base/java.nio.file.spi.FileSystemProvider.newOutputStream(Unknown Source)
	at java.base/java.nio.file.Files.newOutputStream(Unknown Source)
	at java.base/java.nio.file.Files.write(Unknown Source)
	at org.cryptomator.cryptofs.CryptoFileSystemProvider.initialize(CryptoFileSystemProvider.java:172)
	at org.cryptomator.cryptofs.CryptoFileSystemProvider.initialize(CryptoFileSystemProvider.java:149)
	at org.cryptomator.ui.addvaultwizard.CreateNewVaultPasswordController.initializeVault(CreateNewVaultPasswordController.java:164)
	at org.cryptomator.ui.addvaultwizard.CreateNewVaultPasswordController.lambda$showSuccessScene$5(CreateNewVaultPasswordController.java:151)
	at org.cryptomator.ui.common.Tasks.lambda$create$0(Tasks.java:34)
	at org.cryptomator.ui.common.Tasks$TaskImpl.call(Tasks.java:140)
	at javafx.concurrent.Task$TaskCallable.call(Task.java:1425)
	at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
	at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.base/java.lang.Thread.run(Unknown Source)

If i read the error correct there is a access problem. But i can create folders, create files, change them and delete them on the selected network drive.

Can anyone help, what am i doing wrong?