Hi James,
Please see the following comment on Microsoft documentation:
A Microsoft account is required for using Azure Lab Services unless using Canvas. If you are trying to use your non-Microsoft account such as Yahoo or Google accounts to sign in to the portal, follow instructions to create a Microsoft account that will be linked to your non-Microsoft account. Then, follow the steps to complete the registration process.
https://video2.skills-academy.com/en-us/azure/lab-services/how-to-use-lab
If this is helpful please accept answer.