To log in to TCM Moodle, first you need to go to learn.tcmi.edu.
On this page, you will see the following screen:
You need to click on “Microsoft 365” button and then follow the regular login process.
On the next screen you will need to give your @tcmi.edu email and your password.
Lastly, you will need to confirm it is really you through two-step verification.
You can see a guide for using two-step verification here.