The HMRC servers are designed to handle a large number of simultaneous submissions, and to always either succeed in processing or give a clear message and allow submission to be continued later. In order to make that possible, the servers process your submission via several different steps. There will always be a delay between each step, and at very busy periods (for example the last week of January) HMRC servers can take a significant amount of time to handle the queue. The ABC application will keep you informed of progress, and if the submission does fail to be processed, you will get a clear message and be able to try again.
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