Hey, how you doing?
Thank you for contacting us and welcome to the Microsoft Community.
My name is Vitor. I'm an Independent Advisor and I'll be glad to help you today.
I would like you to check the article below. There is the solution to the problem that is occurring. See "Solution".
"We can't display your message right now" error in Outlook Web App when an Exchange Online user views an encrypted message: https://learn.microsoft.com/en-us/microsoft-365...
Thanks,
Vitor S.