QB Issue Resolution:
After updating the subscription billing credit card number in the system, some users will receive the error message “An unexpected failure occurred.”
You should first rule out that your browser is the source of the error. Please try deleting the cache on the browser, also try using the Google Chrome web. For help in doing this, click here.
Users affected by this issue should also make sure that it is not isolated to just one individual credit card, or to one particular type of card (Visa, MasterCard, American Express).
Our specialists are aware of this issue, and are busy implementing a solution. Contacting our phone-based support will allow our agents to explain the options that are available until a fix is released.
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Resolution for Issue 'When I update my billing credit card number, the software displays the error “An unexpected failure occurred”' available: Yes (Solved).
Source: Intuit Community forum.
When I update my billing credit card number, the software displays the error “An unexpected failure occurred”: 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 1100067
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Error Recovery for 1100067 [Canada]
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