QB Issue Resolution:

office expense for the service fee, and maybe the install/equipment

unless the alarm system has a significant price then it would an asset or a fixed asset, check with your accountant

Resolution for Issue 'What expense category should the business security/alarm system go under?' available: Yes (Solved).
Source: Intuit Community forum.

What expense category should the business security/alarm system go under?: this 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 issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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