for a challenge question?  odd

QB will not allow the last 4 passwords to be used for a new password.  Are you trying to use a password as the answer – if so that may be why

Other wise I would call intuit, this new forced password thing may have a bug […]

Resolution for 'challenge question issue: 'How to select and answer a challenge question?' available: Yes.

The challenge question issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the challenge question issue yourself by looking for a resolution described in the article. If it is a complex challenge question issue or you are unable to solve the issue, you may contact us by clicking here or by using other challenge question support options.

For more information about resolving issues related to challenge question in Quickbooks/QBO or to get support for the issue 'How to select and answer a challenge question?', click the link below: