QB Issue Resolution:

For QuickBooks International version, you need to enter your country code followed by a space, then the 10-digit telephone number. Let’s go through your company settings and update the contact info.

  1. Go to the Gear icon.
  2. Select Account and Settings.
  3. Choose the Company tab.
  4. Click anywhere in the Contact info section.
  5. On the Company phone section, input your company phone number (Ex. +123 0111234567).
  6. Click Save, then Done.

The phone number you enter will show on your sales forms and your internal file with Intuit.

I’ve attached screenshots below for your reference. If you wish you to update other company information such as your business name or emails address, this article will guide you through the steps you need to take: Change Business Name, Contact Info, or Tax ID in QuickBooks Online.

Resolution for Issue 'What is the acceptable value for company telephone number?' available: Yes (Solved).
Source: Intuit Community forum.

What is the acceptable value for company telephone number?: 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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