Hi Flükiger Kim,
I understand you're trying to connect to Azure Virtual Desktop (AVD) using the web client.First, please confirm that your Azure for Students subscription is still active and hasn’t reached its spending or service limits. Subscription restrictions can cause unexpected access issues.
Assuming your session hosts are Microsoft Entra ID (formerly Azure AD) joined, there is a required custom RDP property for the host pool custom RDP property:
To access Microsoft Entra joined VMs using the web, Android, macOS, or iOS clients, you must add the following custom RDP property to your host pool:
targetisaadjoined:i:1
Ensure that the user is assigned to the correct application group. Next, verify that they are signing in with the correct credentials. Double-check the username and password, and consider resetting the password to rule out any login issues.
If you're using the web client, check for any cached credential issues. Try clearing the browser’s cache and cookies, or test with a different browser to see if the issue persists.
If you have any further queries, let me know. If the information is helpful, please click on Upvote.
Thank you.