It sounds like the easy solution is to move to a different subdomain, or wait a week until let’s encrypt will give you a cert. The harder way is to add a second subdomain that points to your server and modify your app.yml to request a cert for both subdomains. Set up Let’s Encrypt with multiple domains. Since it appears that your problems started because you’re having trouble with YML formatting, this rather complicated solution might not work for you.
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