Symptoms
A user cannot view the content of an email using desktop email client or baya
Possible Cause
The anti-virus software installed on the desktop may have blocked the viewing of the email content.
There
The email contains the calendar link/Microsoft team link shows the garbled content.
Solution
1. If mail content is visible using the web client, update the anti-virus or disable the recently added plugins.
2. If the source code/garble content is showing in webmail, check if the mail subject contains extra lines or more space.
Reference Topics
Please follow the below-mentioned link to troubleshoot the issue.
https://windowsreport.com/outlook-blank-emails/
https://www.lifewire.com/use-rich-html-formatting-windows-mail-1173500