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You see any of these error messages on your iPhone or iPad when opening Mobile Security:

"Unable to Continue. Error #91000021"

"Unable to Continue. Error #98000004"

Why did this happen?

Your Trend Micro login password includes a non-alphanumeric character.

How do i fix this?

Update your Trend Micro login password to remove the character:

  1. Go to https://account.trendmicro.com/.
  2. Type your email address and password, then click Sign In.
    If you set up Two-Factor Authentication, you will need to type in the verification code sent to your preferred method (Authenticator App, Email or Text).
  3. Tap Menu , then tap the Profile tab.
  4. Tap the Change Password button.
  5. Type your new password in the New Password field.
  6. Retype your new password in the Confirm New Password field.
  7. Tap Save.
    You will be signed out to update your account.
  8. Tap OK.
  9. Log in again with your email address and your new password.

See also