Teams for VDI, FSLogix and Single Sign In Apps

Question

I'm currently deploying Teams Machine Wide Installer 1.6.0.1381 in a Citrix DaaS implementation with Non-Persistent VDAs.

To roam user's personalisations I am using FSlogix.
I have also disabled Workplace AAD join via the registry key

• HKLM\SOFTWARE\Policies\Microsoft\Windows\WorkplaceJoin,
  “BlockAADWorkplaceJoin”=dword:00000001

The following issues are experienced by the user;

1. Launch teams and sign in.
2. Select an app such as Zoom,
3. Click Sign in
4. User is redirected to the Zoom web page to sign in
5. User signs in successfully
6. The web page auto closes and redirects back to teams.
7. The user is not signed in and presented with a sign in page.
8. The user clicks sign in and steps 4-7 are repeated.

The following workaround allows a user to sign in successfully.

1. Exit Teams
2. Delete AppData\Roaming\Microsoft\Teams
3. 1. The user launches and signs back into teams.
4. A notification is presented in teams that they need to restart Teams to enable the new meeting experience.
5. The user doesnt restart teams
6. The user clicks on zoom and clicks sign in
7. The sign in page is loaded in Teams and not a local browser.
8. The sign in is completed successfully and zoom is working.

The important step is step 6. If the user does restart teams before signing into Zoom they are redirected to a sign in with a local browser and the sign in death spiral continues.

Why is the new meeting experience stopping SSO working with Teams Apps?
The above "workaround" is not a suitable fix as this will need to be communicated to all staff internally.