Outlook Classic cannot open protected emails

Facing trouble while opening protected emails in your Outlook Classic. It happens with every 3rd users, this issue arises due to some unavoidable reasons. I am sharing a list of reasons below, in which any one of the reasons occurs when you are trying to open protected emails. So, after reading these reasons, you might find the exectly happen reasons with you.

• Wrong account signed into Outlook
• Missing Microsoft 365
• Outdated Outlook version
• Corrupted Office credentials & authentication cache
• Unsupported Outlook version
• Internet issue with Microsoft services
• Corrupted Outlook profile

These are the major once which is mostly happen to everyone. So, before making any decision regarding a solution, do checks first.