It's all good. Don't panic about it. There are always "work arounds" and sometimes you end up benefiting from the glitches in life. In the same way you wrote this story, with an explanation, write one every day that the publication is unavailable, updating readers and letting everyone know. You can still solicit for writers and have them send their Medium handles to you via email, or leave in the comments, and you'll have a whole list, already to add when the publication's glitch is fixed. In other words, proceed with business as usual, and use every relateable thing as news for your new publication. When it actually launches, transfer all the stories you wrote, by "adding" them to the publication. Just a thought on how to turn lemons into lemonade :-)