There have been others who didn't see ecas updates for a while, even when they got email/letters to invite them to tests or ceremonies.
So there's a chance someone clicked on the "generate invitation" button on March 14, but forgot to click the "send" and "publish on ecas" buttons. Or someone put in the wrong date when they clicked all buttons yesterday. The marvels of technology
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(The fact it only shows the update now, even though you got the mail yesterday is likely standard: the internal information seems to be sent to the external ecas only once per day, some time at night.)