QB Issue Resolution:

A quick way is to press CTRL-ALT-QUESTIONMARK (?) on the keyboard from any screen inside a QBO company.

OR

Company Gear (upper right corner) > Your Company > Account and Settings > Billings & Subscription > Company ID is 10 digits.

Resolution for Issue 'I dont see my company id?' available: Yes (Solved).
Source: Intuit Community forum.

I dont see my company id?: 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.

Support for Account and Settings
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