I have the same problem..
ACME_ERR_MSG20
Response status:400
Error type:urn:ietf:params:acme:error:rejectedIdentifier
Error code:Error creating new order :: Cannot issue for "*.app.br": Domain name is a wildcard for an ICANN TLD (and 1 more problems. Refer to sub-problems for more information.)
Have solution? I use WordPress Multiste with subdomain network, need Wildcard SSL
My domain baita.app.br, dont is subdomain, TLD is app.br