Please forgive me for not attending the workshop, but I couldn't force Teams to cooperate.
I had to go through at least 10 email and passwords resets and best i got to was
AADSTS50020: User account '--@---------.---' from identity provider 'live.com' does not exist in tenant 'STMicroelectronics' and cannot access the application '5e3ce6c0-2b1f-4285-8d4b-75ee78787346'(Microsoft Teams Web Client) in that tenant. The account needs to be added as an external user in the tenant first. Sign out and sign in again with a different Azure Active Directory user account.
Yours sincerely
Tomas Jakubik
