@Colin Khoo Thank you for reaching out to us, would recommend to start the troubleshooting by following the steps mentioned here - https://video2.skills-academy.com/en-us/microsoft-365/troubleshoot/sensitivity-labels/sensitivity-labels-missing
If this doesnt help, feel free to drop me an email to 'AzCommunity@microsoft.com' with Sub - Attn: Givary and following details in the email body:
Link to this thread/post
We can connect offline and discuss further on this.