QB Issue Resolution:

This is a default message that sometimes appears, it is meant to indicate that you are not able to submit the next return at the present time, in this case it is due to the end date not being reached.

Resolution for Issue 'Why is a client who has had his first successful MTD VAT return submitted in QBO now showing as ‘Unable to Connect’ to HMRC – Action Required for the next quarter?' available: Yes (Solved).
Source: Intuit Community forum.

Why is a client who has had his first successful MTD VAT return submitted in QBO now showing as ‘Unable to Connect’ to HMRC – Action Required for the next quarter?: 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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