Dear Sedibana Piet Selesho,
Thank you for posting in Microsoft Community.
We'd love to help, considering that we mainly focus on Project Application/Project Online queries in this category, I'm afraid we may have limited resource for unlocking Microsoft account in lyceum app. We appreciate your understanding.
On one hand, we sincerely recommend you contact lyceum app Support, they have enough resource and escalation channel to help you further.
On the other hand, we will also keep this thread open. Welcome to community members who have similar experience to share insights and suggestions here.
Appreciate your patience and understanding and thank you for your time and cooperation.
Sincerely,
Tina | Microsoft Community Moderator