Acronis Ransomware Protection: "Wrong username or password" error

Symptoms

You provide credentials for your Acronis account.

The credentials are not accepted, and you see this error message:

Wrong username or password.

Solution

1. Make sure, CapsLock is off.
2. Make sure, the correct language is selected on your computer.
3. Open https://account.acronis.com/ and log in to your account on this page. If your credentials are not accepted, follow the on-screen instruction. Othewise, please report your problem at Acronis Forum.