Hi,
Thank you for posting in Microsoft Community.
It looks like you can't open a protected message since you're not getting the One-time passcode. Let's work on this together in finding the best possible solution to this issue.
To better understand the situation, I would like to ask some questions, such as:
- What device are you using in accessing your email account? Windows PC, MAC, iOS or Android
- What email domain are you using? ex. Hotmail.com, Live.com, Outlook.com
- Are you using the Outlook application or Outlook.com in the web?
- Are you being prompted by the system where you can sign in and receive a single-use code?
While waiting for your response to our questions above, kindly check this support article on how to open a protected message - How do I open a protected message? - Microsoft Support
Looking forward for your response soon!
Sincerely,
Leonardo_Y