Hello @Eric Kessler ,
Thanks for the update. I am glad that you are past the issue. I am summarizing this issue such that your solution is marked as an answer for this thread. Please accept this as the answer.
Problem definition: For the Microsoft certification and training related queries, we have advised reaching a dedicated forum over here https://trainingsupport.microsoft.com/en-us/newthread?threadtype=Questions&cancelurl=%2Fen-us
Symptoms:
You mentioned, "When I click on that link, it says: "Enter your mobile number to verify your account
We'll send a verification code in a text message. This helps us eliminate spam – we won't give out your number. The code will expire in about 10 minutes."
Solution:
When I tried the same link with Chrome instead of Edge, it did not ask for a cell phone number, and you could post your question on Microsoft training related forum.